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Silver 2.5 inch bare SATA hard drive with label showing model ST9320421AS

Seagate

Seagate Momentus 7200.3 ST9320421AS 320GB 7200 RPM 16MB Cache SATA 3.0Gb/s 2.5" laptop hard drive

SKU CH-88SK-WK0MA MPN ST9320421AS

A 320 GB 2.5-inch laptop hard drive spinning at 7200 RPM with 16 MB cache and a SATA 3.0 Gb/s interface

  • Total capacity320 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 delivers fast data access
  • 16MB cache buffer smooths burst workloads
  • SATA 3.0Gb/s interface fits standard laptop bays
  • 320GB capacity stores OS, apps and media
  • 5-inch form factor suits notebook upgrades

Capacity and interface

This Seagate Momentus 7200.3 ST9320421AS is a 320GB 2.5-inch internal laptop hard drive. It connects through a SATA 3.0Gb/s interface and spins at 7200 RPM with a 16MB cache.

Upgrade or replacement use

The drive suits owners of older laptops that accept a 2.5-inch SATA drive and need a fresh 320GB mechanical drive. Buyers who want more storage or a solid-state drive should look at other options.

Rotation rate

The single specification that decides fit is the 7200 RPM spindle speed. It determines the drive's average latency of 4.17ms and its performance level for a mechanical laptop drive.

How it compares

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

Price $66.99
Typical for this category: the median of 645 items is $66.99.
Total capacity 320 GB
Typical for this category: the median of 419 items is 320 GB.
Price per TB $209.34 per TB
Cheaper than about 54% of the 416 comparable items (median $233.48 per TB).

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Specifications

Product
Brand nameSeagate
Product lineMomentus 7200.3
Model nameST9320421AS
Total capacity320 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 weight0.45 kg
Package size203 × 152 × 51 mm

Questions about this item

How does the 7200 RPM speed affect everyday performance?

The 7200 RPM spindle delivers an average latency of 4.17ms, which reduces wait times when opening files or launching applications compared to slower laptop drives.

What does the SATA 3.0Gb/s interface mean for transfer speeds?

The SATA 3.0Gb/s link caps the maximum burst throughput at 3.0 Gb/s, so sustained read and write speeds will not exceed that limit in any system.

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

The 2.5" form factor matches the standard laptop internal drive bay, and the bare-drive packaging means it installs directly without extra brackets.

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