i believe the NetApp part number for the drive you are holding is X412 (it should say so on the metal case). you can search for this part online. or if you order a new one - look for X412B as the old part number is not available anymore (see https://kb.netapp.com/app/answers/answer_view/a_id/1000219/loc/en_US). it's important you get a NetApp branded drive. as it usually formatted with non-common block size, offset and come with special frimware.