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Silver 3.5 inch bare hard drive with exposed circuit board

Seagate

Seagate ST3320620A 320GB 7200 RPM 16MB Cache IDE Ultra ATA100 3.5" internal hard drive

SKU CH-QKTF-RQKFP MPN ST3320620A

320GB 3.5-inch IDE desktop drive with 7200 RPM, 16MB cache and perpendicular recording for capacity and reliability

  • Total capacity320 GB
  • Interface typeIDE Ultra ATA100 / ATA-6
  • Form factor3.5 in (8.89 cm)
  • Packaging typeBare Drive
  • Flash memory typeHard Drive
  • Rotational speed7,200 RPM
  • 7200 RPM spindle speed delivers responsive desktop performance
  • 16MB cache buffers frequent read and write operations
  • IDE Ultra ATA100 interface fits legacy motherboard connectors
  • 320GB capacity stores operating system plus everyday files
  • Perpendicular recording technology increases areal density for reliable storage

BarraCuda 7200.10 320 GB IDE drive

This 3.5 inch desktop hard drive uses the IDE Ultra ATA100 interface and spins at 7200 RPM with a 16 MB cache. It suits owners of legacy systems that still rely on parallel ATA connections for primary storage or backup.

Interface limits at ATA-6

The Ultra ATA100 / ATA-6 bus tops out at 100 MB per second, so sustained throughput cannot exceed that ceiling regardless of platter speed. Average seek is 11 ms, average write is 12 ms and average latency is 4.16 ms, figures that reflect the mechanical constraints of the era.

Bare drive build and daily implications

The bare drive arrives without cables, brackets or mounting screws, so installers must supply their own 40-pin IDE ribbon and a spare 3.5 inch bay. Perpendicular recording and G-Force protection were designed for reliability in older chassis, while RoHS compliance confirms restricted substance limits.

How it compares

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

Price $84.99
Cheaper than about 57% 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 $265.59 per TB
Pricier than about 83% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameSeagate
Product lineBarraCuda 7200.1
Model nameST3320620A
Total capacity320 GB
Performance
Rotational speed7,200 RPM
Average seek time11 ms
Mean write time12 ms
Mean latency4.16 ms
Storage
Flash memory typeHard Drive
Cache memory16 MB
Ports & slots
Interface typeIDE Ultra ATA100 / ATA-6
Size & build
Form factor3.5 in (8.89 cm)
Shipping weight0.59 kg
Package size146 × 102 × 28 mm

Questions about this item

Which capacity of the Seagate ST3320620A should I pick for a desktop upgrade?

The drive is offered in a single 320GB capacity, so there is no choice to make — it fits any 3.5" bay that accepts an IDE Ultra ATA100 device.

What does the 7200 RPM spindle speed deliver once the drive is installed?

A 7200 RPM rotation rate combined with a 16MB cache yields an average seek time of 11ms and average latency of 4.16ms, giving responsive desktop performance on the IDE Ultra ATA100 bus.

What does the IDE Ultra ATA100 interface cap at in practice?

The ATA-6 Ultra ATA100 interface limits burst transfers to 100 MB/s, and real-world throughput will be lower due to the 7200 RPM mechanics and 11ms seek time.

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