Before starting Parallels Compressor, perform the following steps:
This will allow you to restore your virtual machine in case you do not like the results of the compression.
Warning: The result of virtual machine compression is irreversible.
chkdsk.exe
utility.Check if the virtual machine whose hard disk you are going to compress meets the following requirements:
Note: The disk format can be checked in the Hard Disk pane of Virtual Machine Configuration. To access the Hard Disk pane, choose Configure from the Virtual Machine menu and select the Hard Disk item. If the disk is plain, you can convert it to an expanding one using Parallels Image Tool.
Other types of virtual hard disks can be successfully compressed with Parallels Compressor.