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Silver 2.5 inch SATA laptop hard drive, bare drive

Seagate

Seagate ST9320320AS 320GB 5400 RPM 8MB SATA 3.0Gb/s 2.5" laptop hard drive

SKU CH-DF0M-ESSVG MPN ST9320320AS

320 GB 2.5" SATA laptop drive spinning at 5400 RPM with 8 MB cache and 5.6 ms latency

  • Total capacity320 GB
  • Interface typeSATA 3.0Gb/s
  • Form factor2.5 in (6.35 cm)
  • Packaging typeBare Drive
  • Cache memory8 MB
  • Mean latency5.6 ms
  • 320 GB capacity stores large media libraries
  • 5400 RPM spindle speed balances performance and power draw
  • 8 MB cache accelerates frequent file access
  • SATA 3.0 Gb/s interface fits standard laptop bays
  • 6 ms average latency reduces wait times

2.5-inch SATA 3.0Gb/s 320GB laptop drive

The Seagate ST9320320AS is a 2.5-inch internal hard drive with a 320GB capacity, 5400 RPM spindle speed and 8MB cache. It connects through a SATA 3.0Gb/s interface and has an average latency of 5.6ms. The unit is supplied as a bare drive in new condition.

Suits older laptops needing a direct SATA

This drive fits 2.5-inch SATA bays in legacy notebooks or external enclosures that accept a 3.0Gb/s mechanical disk. It is not for machines that only accept M.2 or PCIe modules, nor for users who need solid-state speeds or larger capacities.

The SATA 3.0Gb/s interface decides compatibility

The drive uses the SATA 3.0Gb/s interface, so the host system must provide a matching 2.5-inch SATA connector and support 3.0Gb/s signalling. Without that specific interface the drive cannot be installed or used.

How it compares

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

Price $55.99
Cheaper than about 60% of the 645 comparable items (median $66.99).
Total capacity 320 GB
Typical for this category: the median of 419 items is 320 GB.
Price per TB $174.97 per TB
Cheaper than about 60% of the 416 comparable items (median $233.48 per TB).

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Specifications

Product
Brand nameSeagate
Model nameST9320320AS
Total capacity320 GB
Performance
Mean latency5.6 ms
Rotational speed5,400 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 size127 × 83 × 13 mm

Questions about this item

Does the bare drive include mounting screws or a SATA cable, or must I supply them separately?

The drive is supplied as a bare unit only. Mounting screws, a SATA data cable and any adapter brackets are not included and must be sourced separately.

This model is listed as Momentus 5400.5 — is that the only version available for the 320 GB capacity?

The ST9320320AS is the Momentus 5400.5 variant. No other version or capacity is offered under this part number.

With a 5400 RPM spindle and 8 MB cache, what sustained transfer rate should I expect inside a laptop?

The SATA 3.0 Gb/s interface caps the burst rate, while the 5400 RPM mechanism and 5.6 ms average latency determine real-world sustained throughput.

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