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Silver 3.5 inch bare hard drive with exposed circuit board

Seagate

Seagate BarraCuda 7200.10 ST3320820AS 320GB 7200 RPM 8MB Cache SATA 3.0Gb/s 3.5" internal hard drive

SKU CH-WFAJ-6J3HX

A 320 GB 3.5-inch desktop hard drive spinning at 7200 RPM with 8 MB cache and a SATA 3.0 Gb/s interface

  • Total capacity320 GB
  • Interface typeSATA 3.0Gb/s
  • Form factor3.5 in (8.89 cm)
  • Packaging typeBare Drive
  • Flash memory typeHard Drive
  • Rotational speed7,200 RPM
  • 320 GB capacity stores large media libraries
  • 7200 RPM spindle speed speeds up file access
  • 8 MB cache buffers bursts for smoother throughput
  • SATA 3.0 Gb/s interface fits standard desktop bays
  • Perpendicular recording technology boosts areal density and reliability

Desktop storage for everyday computing

This Seagate BarraCuda 7200.10 drive provides 320GB of internal storage for desktop PCs. The 3.5 inch form factor fits standard drive bays and the SATA 3.0Gb/s interface connects directly to compatible motherboards. It suits users adding a secondary drive for documents, media or backup tasks. Builders needing higher capacities or faster interfaces should consider other options.

Thermals noise and power in normal use

The drive spins at 7200 RPM with an average latency of 4.16ms and is described by the manufacturer as whisper-quiet during operation. Perpendicular recording technology helps maintain reliability while the 8MB cache buffers routine read and write requests. No specific power-draw figures are supplied so thermal output under sustained load cannot be quantified.

Included accessories and software impact

The product is supplied as a bare drive without cables, mounting screws or installation software. Enhanced G-Force Protection guards against handling shocks before the drive is mounted. Clean Sweep calibration and Directed Offline scan diagnostics run in the background to maintain data integrity. RoHS compliance confirms restricted substances are limited in the manufacturing process.

How it compares

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

Price $100.99
Typical for this category: the median of 4,938 items is $107.99.
Total capacity 320 GB
Lower than about 87% of the 2,372 comparable items (median 2 TB).
Price per TB $315.59 per TB
Pricier than about 85% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameSeagate
Product lineBarraCuda 7200.1
Model nameST3320820AS
Total capacity320 GB
Performance
Rotational speed7,200 RPM
Mean latency4.16 ms
Storage
Flash memory typeHard Drive
Cache memory8 MB
Ports & slots
Interface typeSATA 3.0Gb/s
Size & build
Form factor3.5 in (8.89 cm)

Questions about this item

How do I install this 3.5" SATA drive and what step is often missed?

Mount the drive in a 3.5" bay, connect the SATA data cable to a 3.0Gb/s port and attach a SATA power connector; the step often missed is ensuring the motherboard SATA controller is set to AHCI mode in BIOS for full 78 MB/s sustained transfer performance.

What maintenance or replacement will this ST3320820AS need over time?

As a mechanical 7200 RPM drive with perpendicular recording, it requires no scheduled maintenance; plan replacement when SMART attributes report reallocated sectors or when the 4.16ms average latency rises noticeably during sustained workloads.

What limit appears first during sustained use of this 320GB BarraCuda?

The 78 MB/s maximum sustained data transfer rate of the SATA 3.0Gb/s interface becomes the bottleneck before the 8MB cache or 7200 RPM spindle can saturate the bus during large sequential reads or writes.

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