If I'm not mistaken laptop HD's also run at 5400 rpm. I know people who use the usb powered drives and don't have any problems.
As an unrelated side note:
I use an externally powered HD with my laptop which is 7200 rpm. Every once in a while it will connect as usb 1 instead of usb 2. When it's in usb1 mode it can take a good 5 seconds for songs to cue up but otherwise runs OK. I have to reboot to get it to connect properly.
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