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My MacBook Air has only a 64G hard drive which is so small that I don't want to install virtual machines on it. I'm planning to buy a 1TB portable USB hard disk to run virtual machines. Has anyone tried running a Windows 7 VirtualBox virtual machine on a USB3.0 hard drive with success?

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Did it work? If so which hard disk did you use? – Donia Amer Jul 13 at 21:12
up vote 6 down vote accepted

Yes, it's possible.

First you need to create the virtual machine, after you completed the wizard don't start the VM but go to the menu Machine -> Show in Finder

Copy the 3 files (VM Name.vbox, VM Name.vbox-prev, VM Name.vdi) to your external hard disk.

After select the VM inside virtualbox and go to menu Machine -> Remove... and click the button Delete all files

After go to menu Machine -> Add.. and select the VM file you copied before.

Now the VM is inside virtualbox and runs from your external hard disk.

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