GarageBand files to flash drive

I'm sure this will seem obvious to those of you already in the know, but after spending what seems like days waiting for fairly large GarageBand files to copy to my iDisk, I inserted a 2gb flash drive and found that files copy to it in minutes. It seems so easy that I keep expecting the files not to open (I want to copy them to a MacBook Pro, which I expect to have in a couple of days) but they do - on my present machine anyway. I'm now thinking of buying an 8gb flash drive to copy even larger files. Unless someone knows of a reason why copying to flash drives isn't a good idea, I recommend it to anyone who's experiencing the sort of trouble I've been having with the yawningly slow iDisk.