To speed up my testing, I need to prepare a disk with some files, do some operations on disk (modify files, create new files...), and return back to clean state (before doing operations) quickly. I know about VHD files which can be mounted with "undo support", but I cannot find how to use this in Windows 7.
I wouldn't mind some other options too. My disk will not fit into the memory, so RAM disk is not an option. Booting virtual machines and doing snapshots is not an option too.
I am using Windows 7 (RC).