I put the disk back into the original machine on the same IDE channel as it was before and got CHS = 7486,16,63 Everything seems to be working fine at the moment. I know that more modern drives don't use CHS - they use LBA. Is having the wrong CHS a problem or does it matter at all? Thanks, Mark >You may want to try putting the drive on the same >cable as it previously was >(master or slave shouldn't matter). I have had this >problem with a drive >before a year or so back, and I was told it had >something to do with the >controller chip for the primary IDE not being the >same as the secondary IDE >(one was UDMA 33 and the other was 66... or somesuch >on the particular >motherboard) and thus the drive geometry was getting >differently detected.