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Seagate BarraCuda 3.5 inch SATA hard drive bare silver aluminium casing label ST3320418AS

Seagate

Seagate BarraCuda 7200.12 ST3320418AS 320GB 7200 RPM 16MB SATA 3.0Gb/s 3.5" internal hard drive

SKU CH-J9PD-YQ1C8 MPN ST3320418AS

320 GB 3.5" desktop hard drive with 7200 RPM, 16 MB cache and SATA 3.0 Gb/s interface

  • Total capacity320 GB
  • Interface typeSATA 3.0Gb/s
  • Form factor3.5 in (8.89 cm)
  • Packaging typeBare Drive
  • Rotational speed7,200 RPM
  • Cache memory16 MB

Capacity 320GB

  • 320 GB capacity stores large file collections
  • 7200 RPM spindle speed delivers quick data access
  • 16 MB cache buffers bursts for smoother throughput
  • SATA 3.0 Gb/s interface connects to standard desktop ports
  • Perpendicular recording technology enables reliable high-density storage

Capacity and interface

This 320GB desktop hard drive uses a SATA 3.0Gb/s connection and spins at 7200 RPM with a 16MB cache. It is built for standard 3.5-inch drive bays in desktop PCs and servers that accept SATA drives.

SATA 3.0Gb/s practical limits

The SATA 3.0Gb/s interface caps theoretical throughput at 3.0 gigabits per second. Real-world transfer rates will be lower and depend on the host controller, cable quality and system load. Average latency is 4.16ms.

Compatibility checklist

Verify your motherboard or controller has a free SATA port and that your power supply provides a SATA power connector. Ensure the chassis has a 3.5-inch mounting bay with adequate clearance. This bare drive ships without cables, brackets or formatting.

How it compares

Measured against everything we stock in 3.5-Inch Internal Desktop HDDs, at today’s prices. Recalculated every night.

Price $43.99
Cheaper than about 83% of the 4,938 comparable items (median $107.99).
Total capacity 320 GB
Lower than about 87% of the 2,372 comparable items (median 2 TB).
Price per TB $137.47 per TB
Pricier than about 70% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameSeagate
Product lineBarraCuda 7200.12
Model nameST3320418AS
Total capacity320 GB
Performance
Rotational speed7,200 RPM
Mean latency4.16 ms
Storage
Cache memory16 MB
Ports & slots
Interface typeSATA 3.0Gb/s
Size & build
Form factor3.5 in (8.89 cm)
Shipping weight0.41 kg
Package size152 × 114 × 25 mm

Other versions of this model

4 more in the same range

Questions about this item

Should I pick the 320 GB version or a larger BarraCuda 7200.12 drive?

This listing is for the 320 GB model only. If you need more space, choose a higher-capacity BarraCuda 7200.12 drive instead.

What does the 7200 RPM speed actually deliver in a desktop PC?

The 7200 RPM spindle gives an average latency of 4.16 ms, so the drive responds quickly for everyday desktop workloads.

The drive uses SATA 3.0 Gb/s — what does that limit in practice?

The SATA 3.0 Gb/s interface caps the maximum transfer rate at 3.0 Gb/s, which is the ceiling for sequential reads and writes on this drive.

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