Reclaim free disk space
Before using the Virtual Disk Assistant in Microsoft Virtual PC to reclaim space on a virtual hard disk image, you must first use a third-party product to "zero out" or permanently remove all data from the virtual hard disk image. You can then use the Virtual Disk Assistant to finish the process. Before you begin, be sure there is enough space free on your Macintosh hard drive for the temporary file.
If it is not shut down completely, start the virtual machine. In Microsoft Virtual PC, on the PC menu, click Shut Down. Click the Shut down option, and then click the Shut Down button.
Note You can reclaim disk space only on a dynamically expanding virtual hard disk image.
See also