Seagate Laptop Thin HDD ST500LM021 500GB SATA 6.0Gb / s 2.5" Laptop Thin Hard Drive

  Seagate Laptop Thin HDD ST500LM021 500GB SATA 6.0Gb / s 2.5" Laptop Thin Hard Drive
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  • $79.99
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  • $7.39

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18 In StockNew2 Year

Seagate ST500LM021 Hard Drive, 2.5" Form Factor, 7mm Height, 500GB Capacity, 32MB Cache, 7200RPM Spin Speed, SATA 6Gb/s.



Momentus Thin Hard Drive


Slim-computing savvy

Momentus Thin hard drives offer feature-rich, slim, lightweight style at price and capacity points that enable no-compromise designs for thin computing.


  • World's first 7mm z-height, 2.5-inch form factor drive
  • Seagate SmartAlign technology1 provides a transition to 4K sectors without the need for software utilities
  • Available as a Self-Encrypting Drive (SED) with TCG Opal protocol, and as a FIPS 140-2 Validated SED for government-grade security
  • Compatible with SATA 3Gb/s designs



Opens new frontiers for system designers

Seagate has purpose-built the Momentus Thin hard drive to meet our customers' demand for affordable, slimmer, fully functional computing solutions. Meet your needs with 500GB, 320GB, 250GB and 160GB capacity options.

While traditional laptop hard drives offer a z-height of 9.5 mm, Momentus Thin hard drives stands apart with a z-height of just 7mm.



Smooth migration to Advanced Format

Momentus Thin hard drives include Seagate SmartAlign technology1. This innovation helps you easily get all the benefits of the new Advanced Format 4K sector standard-no utilities, no extra steps.



Secure Self-Encrypting Drive options

Momentus Thin Self-Encrypting Drives deliver government-grade encryption without performance degradation-protecting your data where it lives. You get all the benefits of secure data encryption without the headaches.


  • The first Seagate SED to ship with the Trusted Computing Group (TCG) Opal protocol
  • The world's first 7mm SED to ship with FIPS 140-2 validation






Enter Seagate ingenuity

Until recently, system integrators and OEMs had no choice but to limit their thinner, fully functional computing designs to high-end devices. The available hard drive options were either too costly, too slow performing or both.

Enter Seagate ingenuity. Momentus® Thin hard drives leverage current laptop drives in both material and product design to provide the world's first 7mm 2.5-inch form factor drive.

The result is affordable, thin storage for entry-level to mainstream laptops, high-end netbooks, thin ultraportables and more. Momentus Thin drives open new frontiers in slim-computing design.




Seagate SmartAlign technology for easy 4K migration

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.

Momentus Thin 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.



Optimal security with Self-Encrypting Drives

Momentus Thin hard drives are available as Self-Encrypting Drives (SED) that help secure your data the instant you save it to your drive. For government-grade security, the Momentus Thin hard drive can also be purchased as a FIPS 140-2 Validated SED.

Lost laptop? Rest easy knowing that your data is secure and 100% encrypted-always. Momentus Thin hard drive features include:


  • Instant on-the-fly encryption without performance degradation
  • Instant SecureErase technology that can instantly erase the security key data on your hard drive, enabling secure and easy disposal or repurposing of the drive



HighlightsSeagate ST500LM021 Hard Drive, 2.5" Form Factor, 7mm Height, 500GB Capacity, 32MB Cache, 7200RPM Spin Speed, SATA 6Gb/s.
Interface OptionsSATA 6Gb/s
Bytes per Sector512 / 4096 (logical/physical)
Load/Unload Cycles>600,000
Seek Average11 ms
I/O Data Transfer Rate, Max600 MB/s
Sustained Data Transfer Rate OD, Max135 MB/s
Reliability/Data Integrity
Head-Rest MethodQuiet Step Ramp Load
Nonrecoverable Read Errors per Bits Read, Max1 per 10E14
Annualized Failure Rate (AFR)0.48%
Power Management
Startup Power, Typical1.0 A
Seek, Typical1.8 W
Idle, Typical0.65 W
TemperatureOperating: 0 to 60°C
Nonoperating: −40 to 70°C
ShockOperating: 2ms - 400Gs
Nonoperating: 1ms - 1000Gs
Acoustics (bels - sound power)Idle, Typical: 2.3
Seek, Typical: 2.4
Height0.276" / 7mm
Width2.76" / 70.1mm
Depth3.959" / 100.55mm
Weight0.209lb / 95g
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