Mixture, you mentioned 'hashing', never heard of it before now. Sounds more like a cookery term but never mind. I would be grateful for any pointers as to where to start.
Well I've never heard of it as a cookery term until now (well, excluding Cornbeaf Hash, but that's a dish, not a technique).
But I digress. IT hashes are a very good thing to know about.... they are also file and platform agnostic, i.e. the same file on windows and mac will generate the same hash.
Am I correct in assuming you're in the same league as
boguing when it comes to writing scripts and so need some nice pretty buttons to click on instead ?
If so, for Windows, perhaps try the TreeSize Pro from Jam Software I mentioned above.... I used it in the past, but that was in the days before they introduced the hashing function... so download the demo, turn on hashing and see how you get on.
For mac, I'll take a look around....