
252 Parallels Desktop for Mac User Guide
Selecting Logical Disks for Compression
A virtual machine may have several virtual disks, some of them can be partitioned. In Advanced
mode you can select one or more logical disks for compression.
In the Select Logical Disks dialog box, Compressor displays the list of virtual machine's
volumes.
The following virtual machine's disks cannot be processed by Compressor:
Virtual disks in plain format.
Virtual disks with snapshots.
Undo disks.
Virtual machine compression is performed in two steps:
1 Disk cleaning: removing unnecessary files, disk defragmenting.
2 Disk compacting: reducing the size of a virtual disk file performed in the host operating
system.
If all the selected disks cannot be compressed, Parallels Compressor displays the message that
the compression cannot be performed and stops. If, at least one of the selected virtual disks can
be compressed, Compressor will process them.
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