That would depend entirely upon what your "D: drive" is. Is it a
second partition on a hard drive, an entirely separate internal hard
drive, an internal or external Zip drive, a CD-ROM, a DVD-ROM, or a
USB external drive? When did the drive stop being recognized? What
specific change(s) or event(s) immediately proceeded the problem?
If you can't provide even a modicum of useful information, no one
will be able to help you.
Help us help you:
You can have peace. Or you can have freedom. Don't ever count on
having both at once. -- RAH