PC and Mac 7mm, 9mm SSHD for faster boot up and application performance.
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If you're interested in increasing hard drive capacity and boosting performance in an aging laptop... this hybrid drive is highly recommended.
Check out the review
Optional upgrades for Momentus® laptop hard drives include Seagate® G-Force Protection technology.
When G-Force Protection technology detects that your hard drive has been dropped, it instantly swings the drive heads to a safe zone away from the storage disk. This can keep your critical data safe and recoverable at impact, even if your laptop does not survive.
A change is coming to the hard drive industry. The smallest sector of organized data on a drive is moving from 512 to 4,096 bytes. The new format, known as Advanced Format (AF) 4K, offers advantages like increased efficiency, but migrating your drive can be challenging.
Luckily, Seagate is ready to help you make a seamless transition to 4K sectors.
Select Momentus laptop hard drives feature Seagate SmartAlign technology, which automatically does the work of AF migration in the background. The drive’s performance is not affected, and there is no need for time-consuming utilities required by other AF-enabled drives.
Smart.
Momentus laptop hard drives are available as a Self-Encrypting Drive (SED)* that protects your data the instant you save it to your drive. For government-grade security, Momentus internal hard drives can also be purchased as a FIPS 140-2 Validated SED.**
Lost laptop? Rest easy knowing that your data is protected and 100% encrypted–always.
Select Momentus laptop hard drives features include:
*SED models not available in all countries.
**Not available in all countries. See FIPS 140-2 Level 2 Certificate. TM: The FIPS logo is a certification mark of NIST, which does not imply endorsement by NIST, the U.S., or Canadian governments.

| Generation | 7200.4 | 7200.2 | 5400.6 | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Capacity | 750GB | 500GB | 320GB | 250GB | 320GB | 250GB | 500GB | 320GB | 250GB |
| Show me : | |||||||||
| Form Factor | 2.5" | 2.5" | 2.5" | 2.5" | 2.5" | 2.5" | 2.5" | 2.5" | 2.5" |
| Interface Options | SATA 3Gb/s | SATA 3Gb/s | SATA 3Gb/s | SATA 3Gb/s | SATA 3Gb/s | SATA 3Gb/s | SATA 3Gb/s | SATA 3Gb/s | SATA 3Gb/s |
| Performance | |||||||||
| Spindle Speed (RPM) | 7200 | 7200 | 7200 | 7200 | 7200 | 7200 | 5400 | 5400 | 5400 |
| Cache (MB) | 16 | 16 | 16 | 16 | 16 | 16 | 8 | 8 | 8 |
| Transfer Rate, Max Ext (MB/s) | 300 | 300 | 300 | 300 | 300 | 300 | |||
| Sustained Data Rate OD | |||||||||
| Average Latency (ms) | 4.2 | 4.17 | 4.17 | 4.17 | 4.17 | 4.17 | 5.6 | 5.6 | 5.6 |
| Reliability/Data Integrity | |||||||||
| Nonrecoverable Read Errors per Bits Read | 1 in 1014 | 1 in 1014 | 1 in 1014 | 1 in 1014 | 1 in 1014 | 1 in 1014 | |||
| Annualized Failure Rate (AFR) | 0.5% | 0.5% | 0.5% | 0.5% | 0.48% | 0.48% | 0.48% | 0.48%% | 0.48% |
| Power Management | |||||||||
| Seek, Typical Operating (W) | 2.5 | 1.60 | 1.60 | 1.54 | 1.54 | 1.54 | |||
| Idle, Typical Operating (W) | 0.96 | 0.66 | 0.66 | 1.40 | 1.40 | 1.40 | |||
| Environmental | |||||||||
| Temperature | |||||||||
| Operating | 0° to 60°C | 0° to 60°C | 0° to 60°C | 0° to 60°C | 0° to 60°C | 0° to 60°C | |||
| Non-operating | -40° to 70°C | -40° to 70°C | -40° to 70°C | -40° to 70°C | -40° to 70°C | -40° to 70°C | |||
| Shock | |||||||||
| Operating: Gs (ms) | 350 (2ms) | 350 (2ms) | 350 (2ms) | 350 (2ms) | 350 (2ms) | 350 (2ms) | |||
| Non-operating: Gs (ms) | 1000 (1ms) | 1000 (1ms) | 1000 (1ms) | 1000 (1ms) | 1000 (1ms) | 1000 (1ms) | |||
| Acoustics (bels - sound power) | |||||||||
| Idle | 2.3 | 2.3 | 2.3 | 2.4 | 2.4 | 2.4 | |||
| Operating | 2.5 | 2.5 | 2.5 | 2.6 | 2.6 | 2.6 | |||
| Physical | |||||||||
| Height (in/mm) | 0.370/9.5 | 0.370/9.5 | 0.370/9.5 | 0.370/9.5 | 0.374/9.5 | 0.374/9.5 | 0.374/9.5 | 0.374/9.5 | |
| Width (in/mm) | 2.750/69.85 | 2.750/69.85 | 2.750/69.85 | 2.750/69.85 | 2.76/70.10 | 2.76/70.10 | 2.75/69.85 | 2.75/69.85 | |
| Length (in/mm) | 3.951/100.35 | 3.951/100.35 | 3.951/100.35 | 3.951/100.35 | 3.959/100.55 | 3.959/100.55 | 3.957/100.35 | 3.957/100.35 | |
| Height (in/mm) (maximum) | 0.374/9.5 | ||||||||
| Width (in/mm) (maximum) | 2.75/69.85 | ||||||||
| Length (in/mm) (maximum) | 3.957/100.35 | ||||||||
| Weight (lb/g) | 0.254/115 | 0.238/110 | 0.238/110 | 0.227/105 | 0.203/92 | 0.203/92 | .218/98.8 | 0.218/98.8 | 0.206/93.5 |
| Model Number | Generation | Package | Capacity | Interface | Spindle Speed (RPM) | Cache (MB) | Areal Density | Encryption | Maximum Operating Shock | Storage Type | Length | Width | Height | Typical Weight | AFR | Operating Temperature | Average Operating Power |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ST9750420AS | 7200.4 | Drive Only | 750GB | SATA 3Gb/s | 7200RPM | 16MB | 541 | 350Gs | HDD | 100.35mm | 69.85mm | 9.5mm | 115g | 0.5% | 60°C | ||
| ST9500420AS | 7200.4 | Drive Only | 500GB | SATA 3Gb/s | 7200RPM | 16MB | 394 | HDD | 100.35mm | 69.85mm | 9.5mm | 110g | 0.5% | ||||
| ST9320423AS | 7200.4 | Drive Only | 320GB | SATA 3Gb/s | 7200RPM | 16MB | 394 | HDD | 100.35mm | 69.85mm | 9.5mm | 110g | 0.5% | ||||
| ST9250410AS | 7200.4 | Drive Only | 250GB | SATA 3Gb/s | 7200RPM | 16MB | 394 | HDD | 100.35mm | 69.85mm | 9.5mm | 105g | 0.5% | ||||
| ST320LT023 | 7200.2 | Drive Only | 320GB | SATA 3Gb/s | 7200RPM | 16MB | 425 | 350Gs | 100.55mm | 70.10mm | 9.5mm | 92g | 0.48% | 60°C | 1.30W | ||
| ST250LT021 | 7200.2 | Drive Only | 250GB | SATA 3Gb/s | 7200RPM | 16MB | 425 | 350Gs | 100.55mm | 70.10mm | 9.5mm | 92g | 0.48% | 60°C | 1.40W | ||
| ST9500325ASG | 5400.6 | Drive Only | 500GB | SATA 3Gb/s | 5400RPM | 8MB | 394 | 350Gs | 100.35mm | 69.85mm | 9.5mm | 98.8g | 0.48% | 60°C | 1.78W | ||
| ST9500325AS | 5400.6 | Drive Only | 500GB | SATA 3Gb/s | 5400RPM | 8MB | 394 | 350Gs | 100.35mm | 69.85mm | 9.5mm | 98.8g | 0.48% | 60°C | 1.78W | ||
| ST9320325AS | 5400.6 | Drive Only | 320GB | SATA 3Gb/s | 5400RPM | 8MB | 394 | 350Gs | 98.8g | 0.48%% | 60°C | 1.78W | |||||
| ST9250315AS | 5400.6 | Drive Only | 250GB | SATA 3Gb/s | 5400RPM | 8MB | 394 | 350Gs | 100.35mm | 69.85mm | 9.5mm | 93.5g | 0.48% | 60°C | 1.78W | ||
| STBD1000100 | Kit | 1TB | SATA 3Gb/s | 5400RPM | 8MB | ||||||||||||
| ST905003N1A1AS-RK | Kit | 500GB | SATA 3Gb/s | 5400RPM | 8MB | ||||||||||||
| ST905003N3A1AS-RK | Kit | 500GB | SATA 3Gb/s | 7200RPM | 16MB | HDD | |||||||||||
| ST903203N1A2AS-RK | Kit | 320GB | SATA 3Gb/s | 5400RPM | 8MB | ||||||||||||
| ST90250N1A1AS-RK | Kit | 250GB | SATA 3Gb/s | 5400RPM | 8MB | ||||||||||||
| ST9500423AS | Drive Only | 500GB | SATA 3Gb/s | 7200RPM | 16MB | 541 | 350Gs | HDD | 115g | 0.5% | 60°C |