What is 12 in 7200.12...?

Recently I came across this HD from seagate which is 500GB 7200.12..... while 7200 stands for spindle speed what does 12 mean....?
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More about what 7200
  1. AFAIK it's the generation number, sort of like the "2011 Ford Escort". The drives before the 7200.12's were called 7200.11.
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