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Silver 2.5 inch SATA laptop hard drive, bare drive

Seagate

Seagate Momentus 7200.2 ST9100821AS 100GB 7200 RPM 8MB SATA 3.0Gb/s 2.5" laptop hard drive

SKU CH-6HHD-S7Y2A MPN ST9100821AS

A 2.5" SATA laptop drive with 100GB capacity, 7200 RPM speed and 8MB cache

  • Total capacity100 GB
  • Interface typeSATA 3.0Gb/s
  • Form factor2.5 in (6.35 cm)
  • Packaging typeBare Drive
  • Cache memory8 MB
  • Mean latency4.17 ms
  • 7200 RPM spindle speed delivers faster data access
  • 100GB capacity stores operating system and essential files
  • SATA 3.0Gb/s interface ensures broad laptop compatibility
  • 8MB cache buffers bursts for smoother multitasking
  • Low power consumption extends battery runtime per charge

100 GB 2.5″ SATA laptop drive

The Seagate Momentus 7200.2 ST9100821AS is a 100 GB internal hard drive built for 2.5″ laptop bays. It spins at 7200 RPM with an 8 MB cache and connects through a SATA 3.0 Gb/s interface. The bare-drive unit uses perpendicular recording for data reliability and draws low power to extend battery runtime.

Upgrade seekers and capacity limits

This drive suits owners replacing a failed 2.5″ SATA drive or adding modest storage to an older notebook that accepts the 3.0 Gb/s link. It does not meet the needs of users who require more capacity than 100 GB or who need a 6 Gb/s SATA connection for newer platforms.

SATA 3.0 Gb/s interface

The single specification that decides fitment is the SATA 3.0 Gb/s interface. The drive will operate only in systems that provide a matching SATA data and power connector for 2.5″ devices.

How it compares

Measured against everything we stock in 2.5-Inch Internal Laptop HDDs, at today’s prices. Recalculated every night.

Price $35.99
Cheaper than about 85% of the 645 comparable items (median $66.99).
Total capacity 100 GB
Lower than about 87% of the 419 comparable items (median 320 GB).
Price per TB $359.90 per TB
Pricier than about 67% of the 416 comparable items (median $233.48 per TB).

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Specifications

Product
Brand nameSeagate
Product lineMomentus 7200.2
Model nameST9100821AS
Total capacity100 GB
Performance
Mean latency4.17 ms
Rotational speed7,200 RPM
Storage
Cache memory8 MB
Ports & slots
Interface typeSATA 3.0Gb/s
Size & build
Form factor2.5 in (6.35 cm)
Shipping weight0.09 kg
Package size102 × 102 × 13 mm

Questions about this item

What does the 7200 RPM speed mean for everyday laptop use?

The spindle spins at 7200 RPM with an average latency of 4.17ms, so the drive can locate data faster than slower-spinning notebook drives.

How does the SATA 3.0Gb/s interface affect real-world transfer rates?

The SATA 3.0Gb/s link caps the burst transfer ceiling at 3.0Gb/s; sustained reads and writes will be lower and depend on the 7200 RPM platters and 8MB cache.

Will this 2.5" bare drive fit my laptop's drive bay and caddy?

It uses the standard 2.5" form factor, so it mounts in any notebook bay or caddy designed for 2.5" SATA drives.

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