You’re backing up or copying a disk, The operation fails, and you get a dialogue window with “VSS: can’t read volume data”
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.
Outdated version of the program.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).