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Silver 3.5 inch low profile EIDE hard drive 1.0 inch height

Western Digital

Western Digital 20.5Gb 7200RPM EIDE 40Pin 2MB 66 3.5" Low Profile 1.0

SKU CH-4XY3-PB4GP

A 20.5 Gb 7200 RPM IDE/EIDE internal hard drive with 2 MB buffer, 9 ms seek time, Ultra DMA 66, and a low-profile 3.5-inch form factor measuring 1.0 inch high

  • 5 GB capacity stores more data
  • 7200 RPM spindle speed delivers faster access
  • 2 MB buffer improves burst throughput
  • Ultra DMA 66 interface enables quicker transfers
  • 0 inch low-profile height fits slim bays

20.5Gb IDE internal drive

This Western Digital hard disk provides 20.5Gb of storage on a 3.5-inch form factor with a 1.0-inch low-profile height. It spins at 7200Rpm and connects through a 40-pin IDE interface, making it suitable for legacy desktops or industrial systems that still require parallel ATA storage.

2MB buffer and Ultra DMA 66

The 2MB cache and Ultra DMA 66 support reduce command overhead and raise the interface burst rate to 66MB/s. A 9ms average seek time helps the drive locate data quickly within the constraints of the IDE bus, improving responsiveness for older operating systems and embedded applications.

1.0-inch low-profile constraint

The 1.0-inch z-height is the single specification that determines fit; standard 3.5-inch bays that accept only full-height drives will not accommodate this unit. Verify the chassis clearance before purchase, as the slim profile is not interchangeable with taller mechanisms.

How it compares

Measured against everything we stock in Switch Modules, Transceivers & Add-Ons, at today’s prices. Recalculated every night.

Price $67.99
Typical for this category: the median of 1,517 items is $68.99.

Specifications

Product
Brand nameWestern Digital

Questions about this item

Will the 2 MB buffer need any maintenance or replacement over time?

The 2 MB buffer is built into the drive electronics and has no user-serviceable parts; it requires no maintenance or replacement during the drive's operational life.

What limit appears first when the 7200 RPM spindle runs continuously?

Sustained operation is constrained by the 9 ms average seek time and the Ultra DMA 66 interface ceiling of 66 MB/s, whichever bottleneck the workload hits first.

How much heat and noise does the 1.0-inch low-profile 3.5" drive produce under all-day use?

The 1.1 kg low-profile mechanism runs at 7200 RPM with a 9 ms seek time, generating typical desktop-class heat and acoustic output for continuous operation.

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