> > Imagine: cp file file2, file and file2 reference the same exact blocks,
> > but modified chunks of file2 would be given their own private blocks.
>
> This is not a microsoft innovation, actually, I believe it was a VMS
> innovation. It's called a generational filesystem. the original is
> stored, and later generations of the file are stored as diffs.
As far as I know, VMS simply stores whole files - no diffs involved. Now
if you go back to for instance Univac 1100 and the Exec-8 OS (I suppose
it is OS-1100 now), you'll find a system that *did* store the diffs. In
the form of punched card images! :-)
Steinar Haug, Nethelp consulting, [EMAIL PROTECTED]
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