Please read: Western Digital uses a unique method to differentiate models of different generations that carry the same model number. The method involves adding a unique identifier code as a suffix, separated by a hyphen from the main model number. For example:
WD5000AAKS-00V1A0
Where:
-WD5000AAKS is the main model number. It basically translates to: Caviar Blue, 500GB, 7200RPM, 16MB cache, SATA-300 interface.
-00V1A0 is the identifier code. This particular code has been confirmed to mark drives of the 500GB platter generation.
The identifier code will appear on the top label and be reported by a properly-functioning drive to host, but retailers and the WD website typically only advertise the main model number.
With this in mind, WD drives are sorted into each platter density section by their identifier codes; unchanging main model numbers may appear throughout entire lists, across platter density sections, attached to different codes. The basic format of the code has remained the same over time, and certain parts of the code (such as the first two characters, which have always been numbers) reflect things that are not relevant to this site's purpose. For this reason, the identifier codes in the lists will normally take the form of "xxV1Ax". Actual models may carry such codes as the "00V1A0" above, "22V1A0", or "60V1A0".
Lastly, there is an assumption made in the past that specific identifier codes always point to certain platter densities, but this has been shown (mainly beginning with the 1.0TB/disk generation) to not be the case. The positioning of models by certain identifier codes under certain platter densities will only reflect the best-case scenario known at the time. Actual drives will occasionally sport a component count and/or platter capacity incongruent with what's implied by the lists, for reasons only WD insiders would know. "Recertified" WD drives are much more commonly messy in this regard (regardless of platter capacity generation), and the lists shouldn't be used at all to identify these units.
Anyway, pick a drive width here:
-2.5" (Scorpio/Blue/Black)
-2.5" (AV-25/Red/Green/Blue 12~15mm/USB)
-3.5" (Caviar/Blue/Green/Purple/AV)
-3.5" (RE/Gold/Se/Black/Red/"Internal Use")
-3.5" & 2.5" (Raptor/VelociRaptor/S25/XE)
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