Shrinking Virtual Disks with VMware Virtual Disk Manager
http://www.vmware.com/support/ws55/doc/ws_disk_manager_shrinking.html
On a Windows host, you can use the virtual disk manager to prepare and
shrink virtual disks.
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You cannot use the virtual disk manager to prepare or shrink virtual disks located on a Linux host.
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You cannot use the virtual disk manager to shrink physical disks.