Re: move 100GB between PC's
USB2 or esata would be faster than over 100mb network if you have an external drive.
If you're going down the network route I think it's faster if you pull the files from destination pc, rather than push from source pc. Also, I think I read that its also faster if you actually map a drive to the source directory rather than going to "My Network Places|Entire Network|PC|directory" route.
HTH
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