I'm looking for a RAM disk (preferably free) which gets its contents from a specified folder on the hard disk and also writes changes made to it back to that folder. Is there such a thing for Windows?
I would go with VSuite Ramdisk. Unfortunately it's shareware (50$).
It supports (almost) realtime syncing to hard disk.
Fundamental problem with truly realtime sync would be huge performance loss. If syncing would be synchronous, RAM disk writing speed would be same as with hard disk. Reading speed would be faster though.