I ordered two lots, and all ten SAS drives were in perfect working condition. Had to reformat them to 512 sector size in order to be able to use with a PC (wasn’t mentioned in the description) but it was an easy fix after some research. Just three of them in a RAID 0 array can outrun my fancy Samsung SSD in a benchmark test. Can’t wait to get the cables for the rest. They run fast and hot, just like they're supposed to. They make little noises, but it doesn’t bother me one bit. I like hearing them “talk” from time to time; it’s almost soothing. So happy with these drives!! Thank you!