DOS Boot Can See Drive - Windows XP Can't - Partitition Problems

[alanstad]

Hello,

When I booted up my computer, one of my hard drives is no longer
available to windows.

Here are the symptoms:

1) The drive letters show in Explorer. But there is not used or free
space and I cannot select them.
2) The drive does not show in disk management.
3) If I boot to DOS, I can see the drives fine, navigate to
directories, etc.

Using Partition Table Doctor, I tried rebuilding the MBR and the
partition tables. But it doesn't make any difference.

Any ideas on what to else try?

Thanks so much!

Alan

 

[alanstad]

One more piece of information. Under the device manager, I do see the
drive. The properties are:

Disk: Unknown
Type Unknown
Status: Unreadable
Partition Style: No applicable
Capacity: 0 mb
Unallocated: 0 mb
Reserved: 0 mb