This is a 40GB IBM IDE drive. Its been woring fine in the past and noting new has been installed or modified on this system. The drive passes all tests as a good drive but has no drive letter in Windows. In storage management it appears as healthy - but with no drive letter. I have so far tried:
Removing and redetecting the drive.
Booting with the drive unplugged and then reconnecting it.
Connecting the drive to a different PC - same result.