Seagate MOMENTUS ST9750423AS User Manual
Product Manual  
®
Momentus  
7200-RPM  
5400-RPM  
Standard models  
Free-fall sensor models  
ST9750423AS  
ST9750422AS  
ST9750420AS  
ST9750424AS *  
ST9640424AS  
ST9640423AS  
ST9640422AS *  
ST9500424AS  
ST9500423AS  
ST9500428AS *  
ST9750423ASG  
ST9750420ASG  
ST9640423ASG  
ST9500423ASG  
100627937  
Rev. C  
January 2011  
* specifications for these models are available from Seagate  
technical support www.seagate.com/www/en-us/about/contact_us/  
Contents  
1.0  
2.0  
Seagate Technology support services. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1  
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2  
2.1  
About the Serial ATA interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3  
3.0  
Drive specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4  
3.1  
3.2  
Specification summary table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4  
Formatted capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6  
3.2.1  
LBA mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6  
3.3  
3.4  
3.5  
3.6  
3.7  
3.8  
3.9  
Default logical geometry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6  
Physical organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6  
Recording and interface technology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7  
Physical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7  
Seek time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8  
Start/stop times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8  
Power specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9  
3.9.1  
3.9.2  
3.9.3  
3.9.4  
Power consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9  
Conducted noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11  
Voltage tolerance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11  
Power-management modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12  
3.10  
Environmental specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13  
3.10.1  
3.10.2  
3.10.3  
3.10.4  
3.10.5  
3.10.6  
3.10.7  
Ambient temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13  
Temperature gradient. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13  
Relative humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13  
Wet bulb temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13  
Altitude . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13  
Shock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14  
Vibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14  
3.11  
3.12  
3.13  
Acoustics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15  
Electromagnetic immunity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15  
Reliability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16  
3.13.1  
Free Fall Protection feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16  
3.14  
Agency certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16  
3.14.1  
3.14.2  
3.14.3  
Safety certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16  
Electromagnetic compatibility. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16  
FCC verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17  
3.15  
3.16  
Environmental protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18  
3.15.1  
3.15.2  
European Union Restriction of Hazardous Substances (RoHS) . . . . . . . . . . . . 18  
China Restriction of Hazardous Substances (RoHS) Directive . . . . . . . . . . . . . 18  
Corrosive environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18  
4.0  
5.0  
Configuring and mounting the drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19  
4.1  
4.2  
4.3  
4.4  
Handling and static-discharge precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19  
Configuring the drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20  
Serial ATA cables and connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20  
Drive mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21  
Serial ATA (SATA) interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22  
5.1  
5.2  
5.3  
Hot-Plug compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22  
Serial ATA device plug connector pin definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23  
Supported ATA commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24  
5.3.1  
5.3.2  
5.3.3  
Identify Device command. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26  
Set Features command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30  
S.M.A.R.T. commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31  
Momentus Product Manual, Rev. C  
i
ii  
Momentus Product Manual, Rev. C  
List of Figures  
Figure 1.  
Figure 2.  
Figure 3.  
Figure 4.  
Figure 5.  
Typical +5V only startup and operation current profile (7200-RPM models) . . . . . . . . . . . . . 10  
Typical +5V only startup and operation current profile (5400-RPM models) . . . . . . . . . . . . . 10  
Serial ATA connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20  
Attaching SATA cabling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20  
Mounting dimensions—top, side and end view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21  
Momentus Product Manual, Rev. C  
iii  
1.0  
Seagate Technology support services  
SEAGATE ONLINE SUPPORT and SERVICES  
For information regarding products and services, visit http://www.seagate.com/www/en-us/about/contact_us/  
Available services include:  
Presales & Technical support  
Global Support Services telephone numbers & business hours  
Authorized Service Centers  
For information regarding Warranty Support, visit  
http://www.seagate.com/www/en-us/support/warranty_&_returns_assistance  
For information regarding Data Recovery Services, visit http://www.i365.com  
For Seagate OEM & Distribution partner portal, visit https://direct.seagate.com/portal/system  
For Seagate reseller portal, visit http://spp.seagate.com  
Momentus Product Manual, Rev. C  
1
   
2.0  
Introduction  
This manual describes the functional, mechanical and interface specifications for the following Seagate  
Momentus® model drives:  
Standard models  
ST9750423AS  
ST9750422AS  
ST9750420AS  
ST9640424AS  
ST9640423AS  
ST9500424AS  
ST9500423AS  
Free Fall Protection models  
ST9750423ASG  
ST9750420ASG  
ST9640423ASG  
ST9500423ASG  
These drives provide the following key features:  
• 5400-RPM spindle speed (on ST9750423AS, ST9750423ASG, ST9640424AS, ST9640423AS & ST9640423ASG  
models only)  
• 7200-RPM spindle speed on all other models.  
• 16MB buffer.  
• Free Fall Protection (on ST9750423ASG, ST9750420ASG, ST9640423ASG and ST9500423ASG models only)  
• Quiet operation. Fluid Dynamic Bearing (FDB) motor.  
• High instantaneous (burst) data-transfer rates (up to 3Gb/s).  
• Perpendicular recording technology.  
• State-of-the-art cache and on-the-fly error-correction algorithms.  
• Native Command Queuing (NCQ) with command ordering.  
• Full-track multiple-sector transfer capability without local processor intervention.  
• 1000 Gs nonoperating shock and 350 Gs of operating shock.  
• SeaTools diagnostic software performs a drive self-test that eliminates unnecessary drive returns.  
• The 3D Defense System™, which includes Drive Defense, Data Defense and Diagnostic Defense, offers the  
industry’s most comprehensive protection for disc drives.  
• Support for S.M.A.R.T. drive monitoring and reporting.  
• Support for Read Multiple and Write Multiple commands.  
• Worldwide Name (WWN) capability uniquely identifies the drive.  
2
Momentus Product Manual, Rev. C  
       
2.1  
About the Serial ATA interface  
The Serial ATA interface provides several advantages over the traditional (parallel) ATA interface. The primary  
advantages include:  
• Easy installation and configuration with true plug-and-play connectivity. It is not normally necessary to set  
any jumpers or other configuration options.  
• Thinner and more flexible cabling for improved enclosure airflow and ease of installation.  
• Scalability to higher performance levels.  
In addition, Serial ATA makes the transition from parallel ATA easy by providing legacy software support. Serial  
ATA was designed to allow you to install a Serial ATA host adapter and Serial ATA disc drive in your current  
system and expect all of your existing applications to work as normal.  
The Serial ATA interface connects each disc drive in a point-to-point configuration with the Serial ATA host  
adapter. There is no master/slave relationship with Serial ATA devices like there is with parallel ATA. If two  
drives are attached on one Serial ATA host adapter, the host operating system views the two devices as if they  
were both “masters” on two separate ports. This essentially means both drives behave as if they are Device 0  
(master) devices.  
Note. The host adapter may, optionally, emulate a master/slave environment to host software where two  
devices on separate Serial ATA ports are represented to host software as a Device 0 (master) and  
Device 1 (slave) accessed at the same set of host bus addresses. A host adapter that emulates a  
master/slave environment manages two sets of shadow registers. This is not a typical Serial ATA  
environment.  
The Serial ATA host adapter and drive share the function of emulating parallel ATA device behavior to provide  
backward compatibility with existing host systems and software. The Command and Control Block registers,  
PIO and DMA data transfers, resets, and interrupts are all emulated.  
The Serial ATA host adapter contains a set of registers that shadow the contents of the traditional device regis-  
ters, referred to as the Shadow Register Block. All Serial ATA devices behave like Device 0 devices. For addi-  
tional information about how Serial ATA emulates parallel ATA, refer to the “Serial ATA: High Speed Serialized  
AT Attachment” specification. The specification can be downloaded from http://www.serialata.org.  
Momentus Product Manual, Rev. C  
3
       
3.0  
Drive specifications  
Unless otherwise noted, all specifications are measured under ambient conditions, at 25°C, and nominal  
power.  
3.1  
Specification summary table  
The specifications listed in this table are for quick reference. For details on specification measurement or  
definition, see the appropriate section of this manual.  
Table 1:  
Drive specifications for 750, 640 and 500 GB models  
ST9640424AS  
ST9640423AS  
ST9640423ASG  
ST9750422AS  
ST9750420AS  
ST9750420ASG  
ST9500424AS  
ST9500423AS  
ST9500423ASG  
ST9750423AS  
ST9750423ASG  
Drive specification  
Formatted GB  
750  
640  
750  
500  
Guaranteed sectors  
1,465,149,168  
1,250,263,728  
1,465,149,168  
976,773,168  
Bytes per sector (logical/physical)  
Physical read/write heads  
Discs  
512/4K  
4
4/3  
2
Cache (MB)  
16  
Recording density in BPI (max)  
Track density TPI (tracks/inch max)  
Areal density (Gb/in2 max)  
Spindle speed (RPM)  
1,586k  
341k  
541  
5400  
5.6  
7200  
4.2  
Average latency (ms)  
Internal transfer rate (Gb/s max)  
I/O data transfer rate (Gb/s max)  
ATA data-transfer modes supported  
1130  
3.0  
950  
1305  
1305  
SATA 1.0, Serial ATA Revision 2.6  
PIO modes 0–4  
Multiword DMA modes 0–2  
Ultra DMA modes 0–6  
Height  
9.5 +/- 0.2 mm (0.370 +/-.008 in)  
Width  
69.85 +/- 0.25 mm (2.750 +/- 0.010 in)  
Length  
100.35 +0.20 / -0.25 mm (3.951 +0.008 / -0.010 in)  
115 g (0.254 lb)  
Weight  
Power-on to ready (sec typical)  
Standby to ready (sec typical)  
Track-to-track seek time, read (ms typ)  
Average seek, read (ms typical)  
Average seek, write (ms typical)  
Startup current, +5V (max)  
Seek power (typical)  
Read power (typical)  
3.6  
4.0  
3.0  
2.5  
1.5  
11.0  
13.0  
1.0A  
1.9W  
1.6W  
2.5W  
2.1W  
4
Momentus Product Manual, Rev. C  
                                                                     
Table 1:  
Drive specifications for 750, 640 and 500 GB models  
ST9640424AS  
ST9640423AS  
ST9640423ASG  
ST9750422AS  
ST9750420AS  
ST9750420ASG  
ST9500424AS  
ST9500423AS  
ST9500423ASG  
ST9750423AS  
ST9750423ASG  
Drive specification  
Write power (typical)  
1.85W  
2.4W  
Idle mode, low power (typical)  
Standby mode (typical)  
Sleep mode (typical)  
0.55W  
0.70W  
0.15W ***  
0.15W ***  
Voltage tolerance (including noise)  
Ambient temperature  
+5V ± 5%  
0°C to 60°C (operating)  
–40°C to 70°C (nonoperating)  
Temperature gradient (°C/hour max)  
Relative humidity  
20°C (operating), 35°C (nonoperating)  
5% to 95% (operating and nonoperating)  
30% per hour max  
Relative humidity gradient  
Wet bulb temperature (°C max)  
Altitude, operating  
37.7 °C (operating), 40 °C (nonoperating)  
–304.8 m to 3,048 m (–1,000 ft to 10,000+ ft)  
Altitude, nonoperating  
(meters below mean sea level, max)  
–304.8 m to 12,192 m (–1000 ft to 40,000+ ft)  
Shock, operating (Gs max at 2 ms)  
350  
800  
Shock, nonoperating (Gs max at 2 ms)  
Shock, nonoperating (Gs max at 1 msec) 1000  
Shock, nonoperating (Gs max at 0.5 ms) 1000  
Vibration, operating  
2.0 G (0 to peak, 5–200 Hz)  
1.0 G (0 to peak, 200–500 Hz)  
Vibration, nonoperating  
Drive acoustics, sound power (bels)  
Idle**  
5 Gs (0 to peak, 5–500 Hz)  
2.3 (typical)  
2.5 (max)  
Performance seek  
2.6 (typical)  
2.7 (max)  
Nonrecoverable read errors  
Annualized Failure Rate (AFR)  
Load/Unload (U/UL) cycles  
1 per 1014 bits read  
0.5%  
25°C, 50% relative humidity  
600,000 software-controlled power on/off cycles  
50,000 hard power on/off cycles  
32°C, 80% relative humidity  
5°C, 80% relative humidity  
5°C, 10% relative humidity  
55°C, 16% relative humidity  
600,000 software-controlled power on/off cycles  
50,000 hard power on/off cycles  
Warranty  
To determine the warranty for a specific drive, use a web browser to access the following  
web page: http://www.seagate.com/www/en-us/support/warranty_&_returns_assistance  
From this page, click on the “Verify Your Warranty” link. You will be asked to provide the drive  
serial number, model number (or part number) and country of purchase. The system will dis-  
play the warranty information for your drive.  
Supports Hotplug operation per  
Serial ATA Revision 2.6 specification  
Yes (requires COMRESET from host after a hotplug event)  
*One Gbyte equals one billion bytes when referring to hard drive capacity. Accessible capacity may vary depending on operating environment  
and formatting.  
**During periods of drive idle, some offline activity may occur according to the S.M.A.R.T. specification, which may increase acoustic and  
power to operational levels.  
***Typical notebooks will pull power to the drive when entering S3 and S4; while in the S3 and S4 states, drive sleep and drive standby  
modes will not contribute to battery power consumption.  
Momentus Product Manual, Rev. C  
5
                                               
3.2  
Formatted capacity  
Bytes per sector  
(logical)  
Model  
Formatted capacity*  
Guaranteed sectors  
ST9750423AS, ST9750423ASG,  
ST9750422AS, ST9750420AS and  
ST9750420ASG  
750GB  
1,465,149,168  
ST9640424AS, ST9640423AS and  
ST9640423ASG  
512  
640GB  
500GB  
1,250,263,728  
976,773,168  
ST9500424AS, ST9500423AS and  
ST9500423ASG  
*One Gbyte equals one billion bytes when referring to hard drive capacity. Accessible capacity may vary depending on operating environment  
and formatting.  
3.2.1  
LBA mode  
When addressing these drives in LBA mode, all blocks (sectors) are consecutively numbered from 0 to n–1,  
where n is the number of guaranteed sectors as defined above.  
See Section 5.3.1, "Identify Device command" (words 60-61 and 100-103) for additional information about 48-  
bit addressing support of drives with capacities over 137GB.  
3.3  
Default logical geometry  
Cylinders  
Read/write heads  
Sectors per track  
63  
16,383  
16  
LBA mode  
When addressing these drives in LBA mode, all blocks (sectors) are consecutively numbered from 0 to n–1,  
where n is the number of guaranteed sectors as defined above.  
3.4  
Physical organization  
Drive model  
Read/write heads  
Number of discs  
ST9750423AS, ST9750423ASG, ST9750422AS,  
ST9750420AS and ST9750420ASG  
4
2
ST9640424AS, ST9640423AS and ST9640423ASG  
ST9500424AS, ST9500423AS and ST9500423ASG  
4/3  
6
Momentus Product Manual, Rev. C  
                                         
3.5  
Recording and interface technology  
Interface  
Serial ATA (SATA)  
Perpendicular  
1,586k  
Recording method  
Recording density BPI (bits/in max)  
Track density TPI (tracks/in max)  
341k  
2
Areal density (Gb/in max)  
541  
Spindle speed (RPM) ( 0.2%)  
(ST9750423AS, ST9750423ASG, ST9640424AS, ST9640423AS  
and ST9640423ASG models only)  
5400  
Spindle speed (RPM) ( 0.2%) (all other models)  
7200  
1130  
Maximum Internal transfer rate (Gb/s)  
(ST9750423AS and ST9750423ASG models)  
Maximum Internal transfer rate (Gb/s)  
(ST9750422AS, ST9750420AS, ST9750420ASG, ST9500424AS,  
ST9500423AS and ST9500423ASG models)  
1305  
950  
Maximum Internal transfer rate (Gb/s)  
(ST9640424AS, ST9640423AS and ST9640423ASG models)  
I/O data-transfer rate (Gb/s max)  
Interleave  
3.0  
1:1  
Cache buffer  
16MB (16,384KB)  
3.6  
Physical characteristics  
Drive specification  
Height  
(mm)  
(in)  
9.5 +/-0.2  
0.370 +/-0.008  
Width  
(mm)  
(in)  
69.85 +/-0.25  
2.750 +/-0.010  
Length  
(mm)  
(in)  
100.35 +0.20 / -0.25  
3.951 +0.008 / -.010  
Typical weight  
all models  
115 g  
0.254 lb  
Momentus Product Manual, Rev. C  
7
                                         
3.7  
Seek time  
Seek measurements are taken with nominal power at 25°C ambient temperature. All times are measured using  
drive diagnostics. The specifications in the table below are defined as follows:  
• Track-to-track seek time is an average of all possible single-track seeks in both directions.  
• Average seek time is a true statistical random average of at least 5000 measurements of seeks between  
random tracks, less overhead.  
Table 2:  
Typical seek times  
Typical seek times (ms)  
Track-to-track  
Read  
1.5  
Average  
11.0  
27.0  
Full-stroke (ST9750423AS, ST9750423ASG, ST9640424AS,  
ST9640423AS and ST9640423ASG models only)  
Full-stroke (all other models)  
22.0  
5.6  
Average latency (ST9750423AS, ST9750423ASG, ST9640424AS,  
ST9640423AS and ST9640423ASG models only)  
Average latency (all other models)  
4.2  
Note. These drives are designed to consistently meet the seek times represented in this manual. Physical  
seeks, regardless of mode (such as track-to-track and average), are expected to meet the noted  
values. However, due to the manner in which these drives are formatted, benchmark tests that  
include command overhead or measure logical seeks may produce results that vary from these  
specifications.  
3.8  
Start/stop times  
ST9750423AS, ST9750423ASG,  
ST9640424AS, ST9640423AS  
and ST9640423ASG,  
ST9750422AS, ST9750420AS,  
ST9750420ASG, ST9500424AS,  
ST9500423AS and ST9500423ASG  
Max @ 25°C  
Max @ 25°C  
Time to ready  
Typical  
3.6  
Typical  
4.0  
Power-on to Ready (sec)  
Standby to Ready (sec)  
5.1  
4.0  
5.5  
4.5  
2.5  
3.0  
8
Momentus Product Manual, Rev. C  
                       
3.9  
Power specifications  
The drive receives DC power (+5V) through a native SATA power connector.  
3.9.1 Power consumption  
Power requirements for the drives are listed in the table on page 9. Typical power measurements are based on  
an average of drives tested, under nominal conditions, at 25°C ambient temperature.  
• Spinup power  
Spinup power is measured from the time of power-on to the time that the drive spindle reaches operating speed.  
• Seek mode  
During seek mode, the read/write actuator arm moves toward a specific position on the disc surface and does  
not execute a read or write operation. Servo electronics are active. Seek mode power is measured based on  
three random seek operations every 100 ms. This mode is not typical.  
• Read/write power and current  
Read/write power is measured with the heads on track, based on three 63 sector read or write operations  
every 100 msecs.  
• Idle mode power  
Idle mode power is measured with the drive up to speed, with servo electronics active and with the heads in  
a random track location.  
• Standby mode  
During Standby mode, the drive accepts commands, but the drive is not spinning, and the servo and read/  
write electronics are in power-down model  
Table 3:  
DC power  
ST9750423AS, ST9750423ASG,  
ST9640424AS, ST9640423AS,  
and ST9640423ASG,  
ST9750422AS, ST9750420AS,  
ST9750420ASG, ST9500424AS,  
ST9500423AS and ST9500423ASG  
Power dissipation  
Spinup (max)  
Seek Average  
Write Average  
Read Average  
Idle, performance*  
Idle, active*  
+5V input average (25° C)  
1.0A  
1.9W  
2.5W  
2.4W  
2.1W  
2.0W  
0.96W  
0.70W  
1.85W  
1.6W  
1.4W  
0.80W  
0.55W  
0.15W  
0.15W  
Idle, low power mode*  
Standby  
Sleep  
*During periods of drive idle, some offline activity may occur according to the S.M.A.R.T. specification, which may increase acoustic and  
power to operational levels.  
Momentus Product Manual, Rev. C  
9
                                     
3.9.1.1  
Typical current profile  
Figure 1. Typical +5V only startup and operation current profile (7200-RPM models)  
Figure 2. Typical +5V only startup and operation current profile (5400-RPM models)  
10  
Momentus Product Manual, Rev. C  
   
3.9.2  
Conducted noise  
Input noise ripple is measured at the host system power supply across an equivalent 15-ohm resistive load on  
the +5V line.  
Using 5V power, the drive is expected to operate with a maximum of 100mV peak-to-peak square-wave  
injected noise at up to 10 MHz.  
Note. Equivalent resistance is calculated by dividing the nominal voltage by the typical RMS read/write  
current.  
3.9.3  
Voltage tolerance  
Voltage tolerance (including noise):  
5V 5%  
Momentus Product Manual, Rev. C  
11  
             
3.9.4  
Power-management modes  
The drive provides programmable power management to provide greater energy efficiency. In most systems,  
you can control power management through the system setup program. The drive features the following  
power-management modes:  
Table 4:  
Power management modes  
Power modes  
Active (operating)  
Idle, performance  
Idle, active  
Heads  
Spindle  
Rotating  
Rotating  
Rotating  
Rotating  
Stopped  
Stopped  
Buffer  
Tracking  
Tracking  
Floating  
Parked  
Parked  
Parked  
Full power  
Self refresh—low power  
Self refresh—low power  
Self refresh—low power  
Self refresh—low power  
Self refresh—low power  
Idle, low power  
Standby  
Sleep  
• Active mode  
The drive is in Active mode during the read/write and seek operations.  
• Idle mode  
The buffer remains enabled, and the drive accepts all commands and returns to Active mode any time disc  
access is necessary.  
• Standby mode  
The drive enters Standby mode when the host sends a Standby Immediate command. If the host has set the  
standby timer, the drive can also enter Standby mode automatically after the drive has been inactive for a  
specifiable length of time. The standby timer delay is established using a Standby or Idle command. In Standby  
mode, the drive buffer is in Self Refresh Low Power mode, the heads are parked and the spindle is at rest.  
The drive accepts all commands and returns to Active mode any time disc access is necessary.  
• Sleep mode  
The drive enters Sleep mode after receiving a Sleep command from the host. In Sleep mode, the drive buffer  
is in Self Refresh Low Power mode, the heads are parked and the spindle is at rest. The drive leaves Sleep  
mode after it receives a Hard Reset or Soft Reset from the host. After receiving a reset, the drive exits Sleep  
mode and enters Standby mode with all current translation parameters intact.  
• Idle and Standby timers  
Each time the drive performs an Active function (read, write or seek), the standby timer is reinitialized and  
begins counting down from its specified delay times to zero. If the standby timer reaches zero before any  
drive activity is required, the drive makes a transition to Standby mode. In both Idle and Standby mode, the  
drive accepts all commands and returns to Active mode when disc access is necessary.  
12  
Momentus Product Manual, Rev. C  
                     
3.10  
Environmental specifications  
This section provides the temperature, humidity, shock, and vibration specifications for Momentus drives.  
3.10.1 Ambient temperature  
Ambient temperature is defined as the temperature of the environment immediately surrounding the drive.  
Above 1000 feet (305 meters), the maximum temperature is derated linearly by 1°C every 1000 feet.  
Operating:  
0°C to 60°C (32°F to 140°F)  
Nonoperating:  
–40°C to 70°C (–40°F to 158°F)  
3.10.2  
Temperature gradient  
Operating  
20°C per hour (68°F per hour max), without condensation  
35°C per hour (95°F per hour max), without condensation  
Nonoperating  
3.10.3  
Relative humidity  
Operating  
5% to 95% noncondensing (30% per hour max)  
5% to 95% noncondensing (30% per hour max)  
Nonoperating  
3.10.4  
Wet bulb temperature  
Operating  
37.7°C (99.8°F max)  
40°C (104°F max)  
Nonoperating  
3.10.5  
Altitude  
Operating  
–304.8 m to 3048 m (–1000 ft to 10,000+ ft)  
–304.8 m to 12,192 m (–1000 ft to 40,000+ ft)  
Nonoperating  
Momentus Product Manual, Rev. C  
13  
                           
3.10.6  
Shock  
All shock specifications assume that the drive is mounted securely with the input shock applied at the drive  
mounting screws. Shock may be applied in the X, Y or Z axis.  
Note. Additional shock protection is provided by the Free Fall Protection feature on ST9750423ASG,  
ST9750420ASG, ST9640423ASG and ST9500423ASG models. See Section 3.13.1 for additional  
information about this feature.  
3.10.6.1  
Operating shock  
These drives comply with the performance levels specified in this document when subjected to a maximum  
operating shock of 350 Gs based on half-sine shock pulses of 2ms. Shocks should not be repeated more than  
one time per axis.  
3.10.6.2  
Nonoperating shock  
The nonoperating shock level that the drive can experience without incurring physical damage or degradation  
in performance when subsequently put into operation is 800 Gs based on a nonrepetitive half-sine shock pulse  
of 2 ms duration.  
The nonoperating shock level that the drive can experience without incurring physical damage or degradation  
in performance when subsequently put into operation is 1000 Gs based on a nonrepetitive half-sine shock  
pulse of 1 ms duration.  
The nonoperating shock level that the drive can experience without incurring physical damage or degradation  
in performance when subsequently put into operation is 1000 Gs based on a nonrepetitive half-sine shock  
pulse of 0.5 ms duration.  
3.10.7  
Vibration  
All vibration specifications assume that the drive is mounted securely with the input vibration applied at the  
drive mounting screws. Vibration may be applied in the X, Y or Z axis.  
3.10.7.1  
Operating vibration  
The maximum vibration levels that the drive may experience while meeting the performance standards speci-  
fied in this document are specified below.  
5–200 Hz  
2.0 Gs (0 to peak). Max displacement may apply below 10 Hz.  
1.0 Gs (0 to peak).  
200–500 Hz  
3.10.7.2  
Nonoperating vibration  
The maximum nonoperating vibration levels that the drive may experience without incurring physical damage or degrada-  
tion in performance when subsequently put into operation are specified below.  
5–500 Hz:  
5 Gs (0 to peak). Max displacement may apply below 22 Hz.  
14  
Momentus Product Manual, Rev. C  
                   
3.11  
Acoustics  
Drive emission of sound is measured consistent with the ECMA-74 and its referenced standards. Testing is  
conducted at room temperature (approximately 25°C). Emission levels are reported as the total A-weighted  
sound power levers for steady state, idle, and active seeks modes of operation.  
Table 5:  
Drive A-weighted Sound Power Levels (SWL, BA)  
Idle*  
Performance seek  
2.3 bels (typ)  
2.5 bels (max)  
2.6 bels (typ)  
2.7 bels (max)  
*During periods of drive idle, some offline activity may occur according to the S.M.A.R.T. specification, which may increase acoustic and  
power to operational levels.  
Test for Prominent Discrete Tones (PDTs)  
Seagate follows the ECMA-74 standards for measurement and identification of PDTs. An exception to this pro-  
cess is the use of the absolute threshold of hearing. Seagate uses the lower limit for the threshold curve* to  
discern tone audibility and to compensate for the inaudible components of sound prior to computation of tone  
ratios according to Annex D of the ECMA-74 standards.  
*Defined as the median curve given by ISO 389-7 (Tf curve) minus 10dB at all frequencies.  
3.12  
Electromagnetic immunity  
When properly installed in a representative host system, the drive operates without errors or degradation in  
performance when subjected to the radio frequency (RF) environments defined in the following table:  
Table 6:  
Radio frequency environments  
Performance  
level  
Reference  
standard  
Test  
Description  
Electrostatic discharge  
Radiated RF immunity  
Contact, HCP, VCP: 4 kV; Air: 8 kV  
B
A
EN 61000-4-2: 95  
80 to 1,000 MHz, 3 V/m,  
80% AM with 1 kHz sine  
900 MHz, 3 V/m, 50% pulse modulation @ 200 Hz  
EN 61000-4-3: 96  
ENV 50204: 95  
Electrical fast transient  
Surge immunity  
1 kV on AC mains, 0.5 kV on external I/O  
1 kV differential, 2 kV common, AC mains  
B
B
A
EN 61000-4-4: 95  
EN 61000-4-5: 95  
EN 61000-4-6: 97  
Conducted RF immunity  
150 kHz to 80 MHz, 3 Vrms, 80% AM with 1 kHz  
sine  
Power Frequency H-field  
immunity  
1 A/m, 50Hz/60Hz, 3 axes  
A
EN 61000-4-8: 97  
EN 61000-4-11: 94  
Voltage dips, interrupts  
30% Reduction for 25 cycles  
>95% Reduction for 250 cycles  
>95%, 0.5 cycles  
C
C
B
Momentus Product Manual, Rev. C  
15  
                       
3.13  
Reliability  
Measurement type  
Specification  
14  
Nonrecoverable read errors  
Annualized Failure Rate (AFR)  
Load/Unload (U/UL)  
1 per 10 bits read, max.  
0.5%  
25°C, 50% relative humidity  
600,000 software-controlled power on/off cycles  
50,000 hard power on/off cycles  
32°C, 80% relative humidity  
5°C, 80% relative humidity  
5°C, 10% relative humidity  
55°C, 16% relative humidity  
600,000 software-controlled power on/off cycles  
50,000 hard power on/off cycles  
Warranty  
To determine the warranty for a specific drive, use a web browser to access the  
following web page:  
http://www.seagate.com/www/en-us/support/warranty_&_returns_assistance  
From this page, click on the “Verify Your Warranty” link. You will be asked to pro-  
vide the drive serial number, model number (or part number) and country of pur-  
chase. The system will display the warranty information for your drive.  
3.13.1  
Free Fall Protection feature  
The Free Fall Protection feature provides enhanced data protection against shock events that may occur while  
the drive is operating. This feature is designed to decrease the likelihood of data loss by detecting a free fall  
event and unloading the actuator before a shock takes place in falls of >8 inches (nominal). The drive uses a  
0G sensor mounted on the printed circuit board assembly (PCBA) to sense this event.  
To enable the Free Fall Protection feature on ST9750423ASG, ST9750420ASG, ST9640423ASG and  
ST9500423ASG models, use Set Features command 41h. To disable this feature, use Set Features command  
C1h.  
Information about Free Fall Events that have occurred is available through SMART Attribute FEh.  
Note. The Free Fall Protection feature is provided only on ST9750423ASG, ST9750420ASG, ST9640423ASG  
and ST9500423ASG models.  
3.14  
Agency certification  
Safety certification  
3.14.1  
The drives are recognized in accordance with UL 60950-1 and CSA C22.2 (950) and meet all applicable sec-  
tions of IEC 60950-1 and EN60950-1 as tested by TUV North America.  
3.14.2  
Electromagnetic compatibility  
Hard drives that display the CE mark comply with the European Union (EU) requirements specified in the Elec-  
tromagnetic Compatibility Directive (89/336/EEC). Testing is performed to the levels specified by the product  
standards for Information Technology Equipment (ITE). Emission levels are defined by EN 55022, Class B and  
the immunity levels are defined by EN 55024.  
Seagate uses an independent laboratory to confirm compliance with the EC directives specified in the previous  
paragraph. Drives are tested in representative end-user systems. Although CE-marked Seagate drives comply  
with the directives when used in the test systems, we cannot guarantee that all systems will comply with the  
directives. The drive is designed for operation inside a properly designed enclosure, with properly shielded I/O  
cable (if necessary) and terminators on all unused I/O ports. Computer manufacturers and system integrators  
should confirm EMC compliance and provide CE marking for their products.  
16  
Momentus Product Manual, Rev. C  
                                                                   
Korean RRL  
If these drives have the Korean Communications Commission (KCC) logo, they comply with paragraph 1 of  
Article 11 of the Electromagnetic Compatibility control Regulation and meet the Electromagnetic Compatibility  
(EMC) Framework requirements of the Radio Research Laboratory (RRL) Communications Commission,  
Republic of Korea.  
These drives have been tested and comply with the Electromagnetic Interference/Electromagnetic  
Susceptibility (EMI/EMS) for Class B products. Drives are tested in a representative, end-user system by a  
Korean-recognized lab.  
• Certificate number: STX-Momentus (B)  
• Trade name or applicant: Seagate Technology International (Wuxi) Co., Ltd.  
• Date of certificate: May 25, 2009  
• Manufacturer/nationality: Seagate Technology (Suzhou) Co., Ltd.  
Australian C-Tick (N176)  
If these models have the C-Tick marking, they comply with the Australia/New Zealand Standard AS/NZS3548  
1995 and meet the Electromagnetic Compatibility (EMC) Framework requirements of the Australian Communi-  
cation Authority (ACA).  
3.14.3  
FCC verification  
These drives are intended to be contained solely within a personal computer or similar enclosure (not attached  
as an external device). As such, each drive is considered to be a subassembly even when it is individually mar-  
keted to the customer. As a subassembly, no Federal Communications Commission verification or certification  
of the device is required.  
Seagate Technology LLC has tested this device in enclosures as described above to ensure that the total  
assembly (enclosure, disc drive, motherboard, power supply, etc.) does comply with the limits for a Class B  
computing device, pursuant to Subpart J, Part 15 of the FCC rules. Operation with noncertified assemblies is  
likely to result in interference to radio and television reception.  
Radio and television interference. This equipment generates and uses radio frequency energy and if not  
installed and used in strict accordance with the manufacturer’s instructions, may cause interference to radio  
and television reception.  
This equipment is designed to provide reasonable protection against such interference in a residential installa-  
tion. However, there is no guarantee that interference will not occur in a particular installation. If this equipment  
does cause interference to radio or television, which can be determined by turning the equipment on and off,  
you are encouraged to try one or more of the following corrective measures:  
• Reorient the receiving antenna.  
• Move the device to one side or the other of the radio or TV.  
• Move the device farther away from the radio or TV.  
• Plug the computer into a different outlet so that the receiver and computer are on different branch outlets.  
If necessary, you should consult your dealer or an experienced radio/television technician for additional sug-  
gestions. You may find helpful the following booklet prepared by the Federal Communications Commission:  
How to Identify and Resolve Radio-Television Interference Problems. This booklet is available from the Super-  
intendent of Documents, U.S. Government Printing Office, Washington, DC 20402. Refer to publication num-  
ber 004-000-00345-4.  
Momentus Product Manual, Rev. C  
17  
                             
3.15  
Environmental protection  
Seagate designs its products to meet environmental protection requirements worldwide, including regulations  
restricting certain chemical substances.  
3.15.1  
European Union Restriction of Hazardous Substances (RoHS)  
Seagate designs its products to meet environmental protection requirements worldwide, including regulations  
restricting certain chemical substances. A new law, the European Union Restriction of Hazardous Substances  
(RoHS) Directive, restricts the presence of chemical substances, including Lead, Cadmium, Mercury,  
Hexavalent Chromium, PBB and PBDE, in electronic products, effective July 2006. This drive is manufactured  
with components and materials that comply with the RoHS Directive.  
3.15.2  
China Restriction of Hazardous Substances (RoHS) Directive  
This product has an Environmental Protection Use Period (EPUP) of 20 years. The following  
table contains information mandated by China's "Marking Requirements for Control of Pollution  
Caused by Electronic Information Products" Standard.  
"O" indicates the hazardous and toxic substance content of the part (at the homogenous material level) is lower  
than the threshold defined by the China RoHS MCV Standard.  
“O”  
RoHS MCV  
表示该部件（于同类物品程度上）所含的危险和有毒物质低于中国  
标准所定义的门槛值。  
"X" indicates the hazardous and toxic substance content of the part (at the homogenous material level) is over  
the threshold defined by the China RoHS MCV Standard.  
“X”  
RoHS MCV  
表示该部件（于同类物品程度上）所含的危险和有毒物质超出中国  
标准所定义的门槛值。  
3.16 Corrosive environment  
Seagate electronic drive components pass accelerated corrosion testing equivalent to 10 years exposure to  
light industrial environments containing sulfurous gases, chlorine and nitric oxide, classes G and H per ASTM  
B845. However, this accelerated testing cannot duplicate every potential application environment.  
Users should use caution exposing any electronic components to uncontrolled chemical pollutants and corro-  
sive chemicals as electronic drive component reliability can be affected by the installation environment. The sil-  
ver, copper, nickel and gold films used in Seagate products are especially sensitive to the presence of sulfide,  
chloride, and nitrate contaminants. Sulfur is found to be the most damaging. In addition, electronic components  
should never be exposed to condensing water on the surface of the printed circuit board assembly (PCBA) or  
exposed to an ambient relative humidity greater than 95%. Materials used in cabinet fabrication, such as vulca-  
nized rubber, that can outgas corrosive compounds should be minimized or eliminated. The useful life of any  
electronic equipment may be extended by replacing materials near circuitry with sulfide-free alternatives.  
18  
Momentus Product Manual, Rev. C  
                 
4.0  
Configuring and mounting the drive  
This section contains the specifications and instructions for configuring and mounting the drive.  
4.1  
Handling and static-discharge precautions  
After unpacking, and before installation, the drive may be exposed to potential handling and electrostatic dis-  
charge (ESD) hazards. Observe the following standard handling and static-discharge precautions:  
Caution:  
• Keep the drive in the electrostatic discharge (ESD) bag until you are ready for installation to limit the drive’s  
exposure to ESD.  
• Before handling the drive, put on a grounded wrist strap, or ground yourself frequently by touching the metal  
chassis of a computer that is plugged into a grounded outlet. Wear a grounded wrist strap throughout the entire  
installation procedure.  
• Handle the drive only by its edges or frame.  
• The drive is fragile—handle it with care. Do not press down on the drive top cover.  
• Always rest the drive on a padded, antistatic surface until you mount it in the computer.  
• Do not touch the connector pins or the printed circuit board.  
• Do not remove the factory-installed labels from the drive or cover them with additional labels. Removal voids  
the warranty. Some factory-installed labels contain information needed to service the drive. Other labels are  
used to seal out dirt and contamination.  
Momentus Product Manual, Rev. C  
19  
                   
4.2  
Configuring the drive  
Each drive on the Serial ATA interface connects in a point-to-point configuration with the Serial ATA host  
adapter. There is no master/slave relationship because each drive is considered a master in a point-to-point  
relationships. If two drives are attached on one Serial ATA host adapter, the host operating system views the  
two devices as if they were both “masters” on two separate ports. This means both drives behave as if they are  
Device 0 (master) devices.  
Serial ATA drives are designed for easy installation with no jumpers, terminators, or other settings. It is not nec-  
essary to set any jumpers on this drive for proper operation. The jumper block adjacent to the signal connector  
is for factory use only.  
3.0 Gbits per second operation  
Limit data transfer rate to  
1.5 Gbits per second  
Jumper block  
SATA power connector  
SATA interface connector  
Figure 3. Serial ATA connectors  
4.3  
Serial ATA cables and connectors  
The Serial ATA interface cable consists of four conductors in two differential pairs, plus three ground connec-  
tions. The cable size may be 30 to 26 AWG with a maximum length of one meter (39.37 inches). See Table 7  
for connector pin definitions. Either end of the SATA signal cable can be attached to the drive or host.  
For direct backplane connection, the drive connectors are inserted directly into the host receptacle. The drive  
and the host receptacle incorporate features that enable the direct connection to be hot pluggable and blind  
mateable.  
For installations which require cables, you can connect the drive as illustrated in Figure 4.  
SATA interface connector  
Power connector  
SATA interface cable  
Power cable  
Figure 4. Attaching SATA cabling  
Each cable is keyed to ensure correct orientation.  
20  
Momentus Product Manual, Rev. C