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The free virtual hard drive images from Microsoft:

is good for testing apps or running apps on Win XP on a Mac or Win 7 system... But I have wondered why on the Mac, the VirtualBox won't allow running both the IE 7 and IE 8 virtual hard drive, saying that there is already such a device (or was it UUID).

Virtual PC can allow that... just wonder why VirtualBox won't allow that and is there any way to bypass that?

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You can use

vboxmanage showhdinfo path\to\vhd

to show the UUIDs. If they are indeed identical, assign a new UUID with

VBoxManage internalcommands setvdiuuid path\to\vhd

or clone it with

VBoxManage clonehd

and then discard the original one.

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