Scenario: you’re backing up or copying a disk, The operation fails, and you get a dialogue window with “VSS: can’t read volume data”
Known cause #1: filesystem or disk errors. This usually results from subtle errors in filesystem data. Windows does a good job in ignoring them, but our programs can’t always do that. You need to correct them with the Windows checkdisk tool.
#1. Launch an elevated command prompt. On Windows 7: Start > All Programs > Accessories > find Command Prompt and right click it > Run as administrator. On Windows 8: right click the faux Start button area > Command Prompt (Admin).
chkdsk X: /f /r
Where X is substituted with the letter of one of the volumes involved in the intended operation (the one you’re trying to back up). The flags /f and/r tell the program to look for filesystem and disk errors and correct them. The program may require restart, in this case input Y > Enter and reboot the computer.
#3. Repeat #2 for every other volume involved in the operation.
Afterwards, run the operation again and see if this helped.
Known cause #2: outdated version of the program. Under some conditions, this could occur in older versions of our software (prior to generation 12). If you’re using one of those, and solution #1 doesn’t help, upgrading should solve the problem.
If you’re still encountering the issue, please send the following additional information to our Support Team:
vssadmin list writers
vssadmin list providers
Send the output (either copy text or make a screenshot).