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Silver rectangular 2.5 inch bare hard drive with circuit board visible

Seagate

Seagate Momentus 7200.2 ST9200420AS 200GB 7200 RPM 16MB SATA 3.0Gb/s 2.5" laptop hard drive

SKU CH-8WWM-C4G43 MPN ST9200420AS

A 200GB 2.5" laptop hard drive with 7200 RPM, 16MB cache and SATA 3.0Gb/s interface

  • Total capacity200 GB
  • Interface typeSATA 3.0Gb/s
  • Form factor2.5 in (6.35 cm)
  • Packaging typeBare Drive
  • Cache memory16 MB
  • Mean latency4.17 ms
  • 7200 RPM spindle speed for fast data access
  • 16 MB cache buffer improves burst transfer performance
  • SATA 3.0 Gb/s interface enables straightforward laptop installation
  • 200 GB capacity stores operating system and applications
  • 5 inch form factor fits standard notebook drive bays

Capacity and interface

The Seagate Momentus 7200.2 ST9200420AS is a 200GB laptop internal hard drive with a SATA 3.0Gb/s interface. It spins at 7200 RPM and includes a 16MB cache for improved data throughput. The 2.5-inch form factor fits standard notebook drive bays and it is supplied as a bare drive.

Suitable upgrades and limitations

This drive suits owners of older laptops that require a SATA 3.0Gb/s replacement or a modest capacity boost. It is not for systems that need a larger capacity than 200GB. It is also not for users who require the lower latency or silent operation of solid-state storage.

Deciding specification

The SATA 3.0Gb/s interface is the single specification that determines compatibility. The host laptop must provide a matching SATA connector and support 2.5-inch drives. Without that interface the drive cannot be installed or recognised.

How it compares

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

Price $48.99
Cheaper than about 69% of the 645 comparable items (median $66.99).
Total capacity 200 GB
Lower than about 67% of the 419 comparable items (median 320 GB).
Price per TB $244.95 per TB
Typical for this category: the median of 416 items is $233.48 per TB.

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Specifications

Product
Brand nameSeagate
Product lineMomentus 7200.2
Model nameST9200420AS
Total capacity200 GB
Performance
Mean latency4.17 ms
Rotational speed7,200 RPM
Storage
Cache memory16 MB
Ports & slots
Interface typeSATA 3.0Gb/s
Size & build
Form factor2.5 in (6.35 cm)
Shipping weight0.09 kg
Package size102 × 76 × 13 mm

Questions about this item

What is the spindle speed that determines the drive's sustained throughput limit?

The drive spins at 7200 RPM, which sets the mechanical ceiling for continuous read and write performance.

How much power does the 7200 RPM mechanism draw and what heat or noise should be expected during all-day operation?

A 2.5" 7200 RPM SATA drive typically draws 2–3 W idle and 4–5 W under load, producing modest warmth and audible seek noise in a quiet laptop.

Which laptop drive bay and cable standard must the system already provide for this drive to install and function?

The drive requires a standard 2.5" SATA drive bay and a SATA 3.0Gb/s data and power connection.

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