Skip to end of metadata
Go to start of metadata


Backup aborted! - Unable to lock <volume>, Please reboot and retry      


This error can be generated during a backup operation when VSS fails to create a snapshot and the alternate Paramount Software snapshot (pssnap.sys) driver fails to start.

This issue can only occur on 32 bit XP and Vista based operating systems.



The following solutions are available:

  • Reboot the machine and attempt the backup again. It is possible that the machine was not rebooted after Macrium Reflect was installed. The alternate snapshot driver requires the machine to be rebooted before it can start successfully.
  • Reinstall the software, reboot the machine and attempt the backup again.

Ultimately it is advisable, and highly desirable, to get VSS working correctly on the computer that you are attempting to backup.