Unable to compress virtual hard disk. The disk cannot be compressed because it is used by the virtual machine that is in Safe mode or Undo Disks mode, or has snapshots

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Symptoms

Parallels Desktop displays the following error message when you are trying to compress virtual machine's hard disk:

    “The disk cannot be compressed because it is used by the "*VM-name*" virtual machine that is in Safe mode or Undo Disks mode, or has snapshots”

Cause

Resolution

Try to compress virtual hard disk after every single resolution step you take:

1. Make sure the virtual hard disk does not have Snapshots: go to Actions -> Manage Snapshots.. and delete all snapshots.

2. Go to the virtual machine configuration > Security -> disable Rollback Mode option if enabled.

3. If your virtual machine was migrated from a real PC, make sure it does not have unallocated space. You may check it in Windows Start menu > Control Panel > Administrative Tool > Disk Management

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