strange disk behaviour
Posted on 2006-06-28
Looking for an explanation :
yesterday i repaired a system, but i would like to know more about what happened; here the situation :
PC has C: disk + CDRom in IDE 0, and D: disk + DVD Writer on IDE 1. ( both disks were maxtor 40 GB )
System does get past POST, but stays with black screen, and a cursor in the top left corner.
After inspection, the cause is drive C: is not seen in the BIOS, all other drives are seen correctly. Even after switching the IDE cables, drive C: remains unseen by the bios.
My conclusion was : bad disk. to be sure, i hooked the drive to another XP system as slave, where the drive was "seen" correctly, and accessable.
after retrying the drive on the failing system, it remained "unseen" in the bios, even after clearing the bios, or trying the IDE disk identification section.
Putting the drive on the other system, and logging on to it with ERD, cured it.
It ran fine from that moment on the bad system, and is again identified correctly.
My question is : how is this possible ? Any explanations ? if possible, backup your reaction with some kind of proof.