Running Win2kProSP4 on a KT-266A system. As D: drive I have a WD 100GB Special Edition drive formatted NTFS Basic. Following a CPU upgrade, this drive has become inaccessible. Used and Free space both show 0 bytes and the volume label is blank. Disk Management shows the logical drive (listed with the right size), Online, and Healthy (Active). However, File System is blank (it should report NTFS). When I run CHKDSK from the command prompt (CHKDSK D: /v), I get the following message, "The type of the file system is NTFS. Unable to determine volume version and state. CHKDSK aborted." It then returns me to the command prompt. The bootsector of this drive appears to be identical to the backup copy of the sector at the end of the volume (no corruption there). Any leads to restoring the drive (with data intact) would be greatly appreciated. 