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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?

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No, it's not. That question is about ramdisks in general, and not talking anything about hard disk sync. – Olli Feb 21 '11 at 12:54
Isn't this what Windows disk cache does? – surfasb Feb 21 '11 at 16:31
Should be I guess. In practice when I compile my solution on a RAM disk its twice as fast as using the hard disk, even when compiling several times in a row. – user56156 Feb 22 '11 at 9:28
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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.

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Looks good, thanks. Of course I meant asynchronously syncing the data back to hard disk. :) – user56156 Feb 22 '11 at 9:26
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