APPLIES TO:

ISSUE

I had Parallels Desktop running on my Mac OS X Snow Leopard and was able to run my Windows virtual machine based on a Boot Camp partition without any problem. Then I upgraded to the new Mac OS X to Lion.

Since that time the virtual machine starts with the following error message:

CAUSE

The Boot Camp hard disk number on Mac OS X Lion differs from the one you had in Snow Leopard.

RESOLUTION

Please re-register your Boot Camp partition in the virtual machine configuration:

1. Open Virtual Machine Configuration by clicking on 'Virtual Machine' menu, choose 'Configure', go to 'Hardware' and select 'Hard Disk 1'.
2. Remove Hard Disk 1 by pressing the "-" sign and save the changes.
3. Then add the Hard Disk by pressing the "+" sign and choose your Boot Camp partition hard disk.
4. Save the changes, close the configuration window and try to start your virtual machine.

NOTE: In case solution above does not help, please contact Parallels Technical Support.