When attempting to perform a Windows FLR (Guest Files ‘Windows’) the restore fails with:
No disks have been mounted. Either disks of this type aren’t supported or some errors occurred. See log file for details.
Confirm that the VM that the files are being restored from was using one the following filesystems.
1. Clear all temporary files from “C:\Users\<serviceaccount>\AppData\Local\Temp\”
Note: When the Veeam Backup Service account is ‘local system’, the temporary directory used is C:\Windows\Temp.
2. Open an Administrator Command Prompt and run the following commands:
(With Veeam v9 the operation must be performed on a Mount Server under the path: C:\Program Files\Common Files\Veeam\Backup and Replication\Mount Service)
If the server you are attempting to restore from has volumes with native 2012 data deduplication, Veeam must be installed on the same operating system and also have the “Data Deduplication” role enabled. The “Data Deduplication” role appears under "File and ISCSi Services" in server manager.
If the Windows FLR continues to fail after attempting the steps outlined in this KB, please attempt and Other-OS FLR. For more information regarding how to do that please review the following: