I'm not set on using the 5400 speed HDs but I can get them to work in the computers I am working on and I can't get these new 7200 speed HDs to work in the same computers! I have tried 6 different HDs in 4 different computers and get the same result every time! I did try to zero them out and I can not get one to zero out! They either stop half way or error out! Do you think i just have a bad batch of HDs?