This item is for one Western Digital WD6400BPVT-75HXZT1 HHCTJBN (WXL1) Malaysia 640gb 2.5" Sata HDD 17JUN2011. This drive and all of our drives are professionally tested and cleaned on a DOD certified machine at Oem level. We do not use software for this process! Once they have passed our Quality control they are 100% in perfect working condition!