2015-04-16 16:40:25 +01:00
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---
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title: VirtualBox
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layout: default
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created: 2009-01-04 15:50:17 +0100
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updated: 2009-07-17 23:14:13 +0200
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toc: false
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tags:
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- know-how
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- software
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- virtualisation
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- oracle
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- virtualbox
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---
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Compacting a disk image
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=======================
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1. overwrite empty blocks on the disk with zeroes. See below for applications.
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1. run the VBoxManage tool like this:[^1]
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VBoxManage modifyhd <NameOfVDIorVMHD> compact
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Applications for overwriting empty blocks
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=========================================
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Eraser (Windows)
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----------------
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2015-04-18 22:30:19 +01:00
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[ [Homepage](http://eraser.heidi.ie/) ] Install as normal. Then go to *Edit* → *Preferences* → *Erasing…* and
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2015-04-16 16:40:25 +01:00
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select the second Tab *Unused disk space*. Create a new method with one pass and a pattern of only zeroes. Now go to
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the "On Demand"-Tasks and create a new one with your local harddisks as target. Run it to perform erasing.
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SDelete (Windows, SysInternals)
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-------------------------------
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[ [Homepage](http://technet.microsoft.com/en-us/sysinternals/bb897443.aspx) ] Download and unpack. Run it like:
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sdelete -c C:\
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dd (Linux)
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----------
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Use something like:
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dd if=/dev/zero of=/junk
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sync
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rm /junk
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This will create a large file with only zeroes and fill up the empty space on your hd.
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zerofree (Linux)
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----------------
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[ [Homepage](http://intgat.tigress.co.uk/rmy/uml/index.html) ] Install the [zerofree](apt://zerofree) package. Run it
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as the man page says.
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<p><div class="notewarning" markdown="1">
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Seems like *zerofree* only supports unmounted filesystems. For this to work you should boot into a recovery Linux
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inside your VM to clean the disk image.
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</div></p>
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sfill (Linux)
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-------------
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Install the [secure-delete](apt://secure-delete) package. Run something like:
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sfill -z -l -l /
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Transparency-Bug in VBox 3.0
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============================
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If you just installed VirtualBox 3.0 and noticed that you only see parts of Windows' titlebars and the icons but no
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text or backgrounds, try the following:
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Run VirtualBox like this: [Found here](http://webupd8.blogspot.com/2009/05/quick-tip-make-virtualbox-os-window-non.html)
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env XLIB_SKIP_ARGB_VISUALS=1 VirtualBox
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[^1]: Older versions of VirtualBox used `modifyvdi` as first parameter. Also this feature is disabled in VBox 2.1.
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