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i have a pc with both usb 2.0 and firewire, i stick with firewire just because i don't want to bother running out and getting the usb 2.0 cable. firewire's faster from what i've noticed, but not by any margin i would consider significant. it also sucks up more cpu overhead like Jolt said, but it's very very rare i'm ever going to transfer more than a gig or two of new music to my ipod.
it took a while to throw on 10gb at first, but ever since then i've only been throwing on a few new albums every now and then.
as far as security, the ipod doesn't have anything built in that would protect it, but think of it as just another hard drive. there's probably thousands of programs out there that will encrypt your files for you before throwing them on there. i wouldn't reccommend RAR or ZIP for anything mission-critical though. it may thwart a quick peak at it, but it's rediculously easy to get around. there are several programs out there that easily crack the pw from it. i believe it's the same with excel files.
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