run the VBoxManage tool like this:1
VBoxManage modifyhd <NameOfVDIorVMHD> compact
[ Homepage ] Install as normal. Then go to Edit → Preferences → Erasing… and select the second Tab Unused disk space. Create a new method with one pass and a pattern of only zeroes. Now go to the "On Demand"-Tasks and create a new one with your local harddisks as target. Run it to perform erasing.
[ Homepage ] Download and unpack. Run it like:
sdelete -c C:\
Use something like:
dd if=/dev/zero of=/junk sync rm /junk
This will create a large file with only zeroes and fill up the empty space on your hd.
Install the secure-delete package. Run something like:
sfill -z -l -l /
If you just installed VirtualBox 3.0 and noticed that you only see parts of Windows' titlebars and the icons but no text or backgrounds, try the following:
Run VirtualBox like this: Found here
env XLIB_SKIP_ARGB_VISUALS=1 VirtualBox
Older versions of VirtualBox used
modifyvdi as first parameter. Also this feature is disabled in VBox 2.1. ↩