Problem machine is Windows Server 2008 R2 file server with the following drives, all NTFS:
C: OS D: File shares E: DFSR staging folders, temp files, and Volume Shadow Copies
The D: drive is configured to place volume shadow copies on E:, and the C: drive has volume shadow copies disabled.
A week ago, a shared folder was removed and the DFS referral deleted. This left an orphaned DFSR replication item, which was removed from display, and all of its staging folders deleted manually.
Several days later, Volume Shadow Copies stopped working.
Run as the standard backup user, an attempt to create a shadow copy fails with "Access Denied", but when run at an elevated command prompt, it fails with a "File system restriction".
Running CHKDSK on E: returns "The type of the file system is RAW." Disk Manager shows "NTFS". Using the "testdisk" tool, the partition table still shows NTFS.
All of the files on the E: drive can be accessed, and temp files are being read and written normally. Existing volume shadow copies can be accessed without trouble.
Using the C: as a test, I found that volume shadow copies can be enabled with the target volume set to C: or D:, but cannot be enabled with the target volume set to E:.
Any ideas what's going on, and could it be related to the earlier DFS issues where the sysadmin deleted settings in the wrong order?