Differences between WD4000FYYZ-01UL1B2 and WD4000FYYZ-01UL1B0?

Dear WD forum,

For the WD RE 4TB Enterprise Hard Drive, who can explain the differences between B0 and B2 in the drive type numbers WD4000FYYZ-01UL1B2 and WD4000FYYZ-01UL1B0?


Those drives are the same. The numbers after the “-” are for WD internal use.

Take a look at this link. maybe this could help.


As Hamlet replied is for internal use.
Although it is common on HDD vendors to mark different manufacturing batches or firmware revisions.