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Off a search on Western Digitals site
Although it seems these drives were created, and only as OEM drives (HP and Dell), this is probably why they arent listed on WD website.http://en.wikipedia.org/wiki/WD_Raptor
Considering that the SATA2 interface does jack all for increasing performance, and the drive is supposedly bigger than the original name scheme id say they are probably slower than the originals. Thats if i can be so bold as to say that.