selling a 2 pack of Maxtor diamondmax 21 500gb sata hard drives. model STM3500630AS. they were tested and checked for bad blocks using the Linux badblocks program. both tests showed 0 bad blocks. they have high power on hours, as seen in the last 2 pictures. they are ready to use and are ntfs formated. these drives came from an old media center PC that was decommissioned.