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Take Control of Running Windows on a Mac by Joe Kissell

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Using Boot Camp Volumes

Parallels and VMware Fusion (but not VirtualBox) have the capability to use a Boot Camp Windows partition directly. This means that if you already have Windows installed under Boot Camp, you can create a new virtual machine in Parallels or Fusion that uses your Boot Camp installation of Windows; you can then use the same Windows installation under either Boot Camp or a virtual machine, whichever best meets your needs at any moment. You also save considerable disk space over what would be required for two separate installations. However, there is a downside: Windows is noticeably slower in Parallels or Fusion when running from a Boot Camp partition than when running from a disk image.

To learn how to use a Boot Camp volume, ...

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