ERROR: Hard disk %1 used by the virtual machine \"%2\" cannot be compressed

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Symptoms

On attempting to compress the virtual hard drive Parallels Desktop displays the following error:

    Hard disk %1 used by the virtual machine \"%2\" cannot be compressed
    The disk is either plain, or dynamic, or contains no data. Such disks cannot be compressed

Cause

Parallels Desktop cannot compress the following types of the virtual hard disk:

Resolution

To merge snapshots, please do the following:

  1. Right click your virtual machine in Parallels Desktop Control Center and choose Manage Snapshots.

  2. Choose snapshots one-by-one starting from the left side and click Delete.

Alternative way:

Follow step-by-step instructions from the article below (Advanced Troubleshooting):

https://kb.parallels.com/9165

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