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Silver rectangular 2.5 inch laptop hard drive bare circuit board visible

Seagate

Seagate Momentus 5400.2 ST9100824AS 100GB 5400 RPM 8MB Cache SATA 1.5Gb/s 2.5" laptop hard drive

SKU CH-28JZ-QNVVH MPN ST9100824AS

100GB 2.5-inch SATA laptop drive with 5400 RPM, 8MB cache and low power draw for longer battery life

  • Total capacity100 GB
  • Interface typeSATA 1.5Gb/s
  • Form factor2.5 in (6.35 cm)
  • Packaging typeBare Drive
  • Cache memory8 MB
  • Average seek time12.5 ms
  • 100GB capacity stores your files and applications
  • 5400 RPM speed delivers responsive data access
  • 8MB cache improves read and write performance
  • Low power consumption extends laptop battery life
  • QuietStep and FDB motor reduce noise and vibration

Capacity and interface

The Seagate Momentus 5400.2 ST9100824AS is a 100GB 2.5" laptop internal hard drive with a SATA 1.5Gb/s interface. It spins at 5400 RPM and includes an 8MB cache for everyday notebook workloads. The drive is supplied as a bare unit without cables or brackets.

SATA 1.5Gb/s practical limits

The SATA 1.5Gb/s link caps the maximum external transfer rate at 1.5 Gb/s, so sustained throughput will not exceed that ceiling. Average seek time is 12.5ms, average write time is 14.5ms and average latency is 5.6ms, which defines the random-access performance envelope. Native Command Queuing is supported to optimise command ordering within those constraints.

100GB capacity decides fit

The 100GB capacity determines whether this drive can hold the operating system, applications and user files required for the target laptop. Buyers who need more storage for large media libraries or multiple virtual machines will find the space insufficient. The 5400 RPM spindle speed and low power draw of 2.2W seek and 0.28W standby suit battery-powered use but do not expand the available capacity.

How it compares

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

Price $64.99
Typical for this category: the median of 645 items is $66.99.
Total capacity 100 GB
Lower than about 87% of the 419 comparable items (median 320 GB).
Price per TB $649.90 per TB
Pricier than about 82% of the 416 comparable items (median $233.48 per TB).

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Specifications

Product
Brand nameSeagate
Product lineMomentus 5400.2
Model nameST9100824AS
Total capacity100 GB
Performance
Average seek time12.5 ms
Mean write time14.5 ms
Mean latency5.6 ms
Rotational speed5,400 RPM
Storage
Cache memory8 MB
Ports & slots
Interface typeSATA 1.5Gb/s
Size & build
Form factor2.5 in (6.35 cm)
Shipping weight0.45 kg
Package size152 × 102 × 51 mm

Questions about this item

Should I pick the 100GB Momentus 5400.2 or a larger capacity model?

The ST9100824AS is a single 100GB model in the 5400.2 series. If you need more space you must choose a different drive; this listing only offers the 100GB capacity.

What real-world throughput does the SATA 1.5Gb/s interface give inside a laptop?

The SATA 1.5Gb/s link caps at 150 MB/s, but the 5400 RPM platters and 8MB cache typically deliver sustained reads well below that ceiling in everyday use.

Does the SATA 1.5Gb/s connection limit performance compared with faster SATA versions?

Yes, the 1.5Gb/s interface tops out at 150 MB/s, so even if the drive could go faster the bus would hold it back.

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