I have a 2 ide hardrive (master-20G 7200 rpm seagate and slave-10G Samsung 5200 rpm). Everything is working fine until recently i defrag my slave hd with diskeeper . Now my slave hd cant be detected by my bios and windows xp professional. Actually its now a "now you see me now you dont" hd. If i turn my comp off and switch it back on, i can see it but when i restart it disappears. What seems to be the problem here?