Comparing the contents of two discs?

Go on, how do I do it?

I'm sure there must be some straightforward free/shareware software
around to `just give me a straightforward list of what's different on
each disc'.

But can I find any?  Nope.

Anyone got any hints or clues?

(it's like this: I've got a HDD and a disc image taken from it some time
ago - I want to check the differences between the two.  Just don't ask
what I've been playing at, okay?  It'd take a long, tedious, pointless,
involved explanation which'd be unhelpful and probably make me seem
madder than usual)

Rowland.

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