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Information Sheet
Legacy Model and Order Numbers
Retired Model and Order Number Formats for WD Products

This document shows how to decipher WD internal drive
model numbers issued prior to December 2005, retail 1 WD
Western Digital
channel model numbers issued between June 2005 and
July 2009, and legacy order numbers issued prior to June 2 Capacity
2005. In most cases, the legacy model and order numbers 2, 3, or 4 digits
Supports up to 999.9 GB
reference end of life products no longer covered by the
current model number format. 3 RPM/Buffer Size or Attribute
A 5400 RPM (multi-platter)
Model Number System - Distribution and OEM B 7200 RPM with 2 MB cache
Channels (Prior to December 2005) C 10,000 RPM
D 4500 RPM
Internal Hard Drives E 5400 RPM (single platter)
The base model number is composed of four sections: F 10,000 RPM with 2 MB cache
G 10,000 RPM with 8 MB cache
1. Company initials (WD) H 10,000 RPM with 4 MB cache
2. Capacity (GB) J 7200 RPM with 8 MB cache
3. RPM/buffer size or attribute K 7200 RPM with 16 MB cache (Desktop)
L 7200 RPM (Quiet Drive)
4. Interface M 5400 RPM (fluid dynamic bearings