User guide

Using Parallels Compressor 253
Compression Levels
Parallels Compressor supports three levels of compression: Low, Medium, High. Each level
suggests the execution of certain tasks. The wizard displays the complete list of such tasks.
The complete list includes the following tasks:

Truncate Page file (recreates the system page file of smaller size);

Clean Up Temporary System Files (deletes temporary files used by the system for
acceleration of operations);

Clean Up System Cache (deletes temporary data stored by the system on disk to increase
performance);

Empty Recycle Bin (permanently removes previously deleted files from the Recycle Bin);

Clean Up Temporary Internet Files (cleans up the Internet Explorer cache, deletes
cookies, history, address bar, temporary files);

Disable Hibernate file (disables hibernate file which stores the virtual machine memory
when the virtual machine is turned off);

Compact virtual disk(s) (reduces the size of disk in host (primary) operating system);

Clean Up Temporary Setup Files (deletes installation files used by MS Office and other
programs);

Clean Up System Media Files (deletes temporary files used by Media Player);

Clean up Drivers Cache (empties the cache for the most popular drivers. If you are going
to install new hardware, clear this check box);

Clean Up System Restore Information (deletes data related to the last successful system
loading).
By default, tasks are assigned to the compression level in the following way:
 High level: all tasks on the list (those marked by
, , )
 Medium level: all tasks marked by
and
 Low level: only tasks marked by
The desired level of compression can be chosen with the help of a slider which has three
positions: Low, Medium, High. For each task on the list there is a check box. When the slider
is at the High position all tasks are selected. Moving the slider from the High to Medium
position, clears check boxes for tasks marked by
; moving the slider to the Low position
clears check boxes for tasks marked by
and leaves selected only those tasks which are
suggested for execution at the Low level (
).
Additionally, with any level chosen, you can add/remove tasks by selecting or clearing
corresponding check boxes. To restore the selection of tasks default for the chosen level, click
the Set as default button.
Note. The check box for the Compact virtual disk(s) task cannot be cleared; this task is
mandatory for each level.
In Express compression mode (or in automatic mode) all tasks are executed as suggested by the
High level, only the Clean up Drivers Cache task is skipped.