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Silver 3.5-inch internal hard drive with label showing 6.4GB capacity

Western Digital

Western Digital 6.4GB 5400RPM ATA-66 2MB Cache 3.5-inch internal hard drive

SKU CH-BY91-JYKMY

A 6.4 GB 3.5-inch desktop hard drive spinning at 5400 RPM with ATA-66 interface and 2 MB cache

  • Flash memory typeSLC
  • 4 GB capacity stores your essential files and operating system
  • 5400 RPM spindle speed delivers reliable performance for everyday desktop tasks
  • ATA-66 interface provides straightforward compatibility with legacy motherboards
  • 2 MB cache buffer helps smooth data transfers during read and write operations

Western Digital 6.4GB ATA-66 Hard Drive

This 3.5-inch internal hard drive offers 6.4GB of storage with a 5400RPM spindle speed and 2MB cache. It uses the ATA-66 interface and SLC NAND flash memory. The drive is supplied new in retail or OEM packaging.

Legacy capacity and ATA-66 interface

This drive suits vintage PC restorations or period-correct storage upgrades that require an ATA-66 connection. Builders needing higher capacities or faster interfaces should consider other options.

How it compares

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

Price $105.99
Typical for this category: the median of 4,938 items is $107.99.

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Specifications

Storage
Flash memory typeSLC

Questions about this item

How do I install the WD64AA 3.5-inch drive in a desktop using the ATA-66 interface?

Mount the 3.5-inch drive in a standard bay, connect the 40-pin IDE cable to the ATA-66 connector and attach a Molex power lead; the step most people miss is setting the master or slave jumper on the rear pins before powering on.

What maintenance or replacement will the WD64AA 6.4GB 5400RPM drive need later?

No routine maintenance is required; listen for new clicking or grinding noises from the 5400RPM spindle and run periodic surface scans — if bad sectors appear or the 2MB cache cannot mask errors, replace the drive.

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