This is an extract from WD’s own “Model Number Format for OEM and Distribution Channels” document – describing what each letter/number of a WD hard drive model number refers to.

Base Model Number

The base model number is composed of six codes:

  1. Company initials (WD)
  2. Capacity (GB/TB)
  3. Capacity unit/form factor
  4. Business unit/brand
  5. RPM/buffer size or attribute
  6. Interface/connector

Model Number Codes

1. Company Initials

WD

2. Capacity

  • Two, three, or four digits, supports up to 999.9.
  • For 1 TB and larger WD Black™ and enterprise drives, the decimal follows the first digit (e.g., WD1000FYPS is a 1 TB capacity drive). These drives also use the last digit of the capacity number as a product code (e.g., WD2003FYYS).
  • This digit does not translate to additional capacity/LBAs.

3. Capacity Unit/Form Factor

  • A GB/3.5-inch
  • B GB/2.5-inch
  • C TB/2.5-inch
  • D TB/2.5- to 3.5-inch backplane adapter
  • E TB/3.5-inch
  • F TB/3.5-inch (new format)
  • G GB/2.5- to 3.5-inch adapter
  • H GB/2.5- to 3.5-inch backplane adapter
  • J TB/2.5-inch
  • K GB/2.5-inch (12.5 mm z-height)
  • L GB/2.5-inch (7 mm z-height)
  • N TB/2.5-inch (15.0 mm z-height)
  • S TB/2.5-inch (7 mm z-height)
  • T TB/2.5-inch (12.5 mm z-height)

4. Business Unit/Brand

  • A Desktop/WD Blue™; WD Green™; WD Black; WD Caviar®
  • B Enterprise/WD RE drive families (3-platter)
  • D Enterprise/WD Raptor®
  • E Mobile/WD Blue; WD Green; WD Black; WD Scorpio®
  • F Desktop NAS/WD Red™
  • H Enthusiast/WD VelociRaptor®
  • K Enterprise/WD XE; WD S25
  • L Enterprise/WD VelociRaptor
  • M Branded/WD Branded
  • N Branded Advanced Format/WD Branded
  • P Mobile Advanced Format/WD Blue; WD Green; WD Black; WD Scorpio
  • R Enterprise Advanced Format/WD RE drive families
  • U Audio/Video Advanced Format – WD AV
  • V Audio/Video – WD AV
  • W Enterprise Advanced Format/WD VelociRaptor
  • Y Enterprise/WD RE drive families (4-platter)
  • Z Desktop Advanced Format/WD Blue; WD Black; WD Green; WD Caviar

5. RPM/Buffer Size or Attribute

  • A 5400 RPM with 2 MB cache
  • B 7200 RPM with 2 MB cache
  • C 5400 RPM with 16 MB cache
  • D 5400 RPM with 32 MB cache
  • E 7200 RPM with 64 MB cache (<2 TB)
  • F 10,000 RPM with 16 MB cache
  • G 10,000 RPM with 8 MB cache
  • H 10,000 RPM with 32 MB cache
  • J 7200 RPM with 8 MB cache
  • K 7200 RPM with 16 MB cache
  • L 7200 RPM with 32 MB cache
  • P IntelliPower™/EM (maximum buffer size offered by product)
  • R 5400 RPM with 64 MB cache
  • S 7200 RPM with 64 MB cache (2 TB)
  • T 10,000 RPM/EM (maximum buffer size offered by product)
  • V 5400 RPM with 8 MB cache (Mobile)
  • Y 7200 RPM/EM (maximum buffer size offered by product)

6. Interface/Connector

  • A ATA/66 with 40-pin IDE connector
  • B ATA/100 with 40-pin IDE connector
  • C ATA with 33-pin connector (zero insertion force—ZIF)
  • D SATA 1.5 Gb/s with 22-pin SATA connector
  • E ATA/133 with 40-pin IDE connector
  • F SAS-3 with 29-pin connector
  • G SAS-6 with 29-pin connector
  • S SATA 3 Gb/s with 22-pin SATA connector / SATA 1.5 Gb/s with 22-pin SATA connector (Mobile)
  • T SATA 3 Gb/s with 22-pin SATA connector (Mobile)
  • X SATA 3 Gb/s, 6 Gb/s capable with 22-pin SATA connector
  • Z SATA 6 Gb/s with 22-pin SATA connector

 

This information was up to date as of July 2012.

The original PDF document is also available for download.

 

Leave a Reply