I've been learning and researching about Time Machine (do I have it right? It's still a bit confusing: HFS+ is dedicated to work only with Macs / NTFS dedicated to only work with PCs / and FAT works with both but cannot keep folders larger than 4 gigs... right?), and it's led me to a question about Flash Drives. Do Flash Drives operate the same as external HDs? Do they have to be a certain version (HFS+, NTFS, FAT) to be able to drag and drop in/out files? And is it okay to interchange between PCs? If I work on my MBP, but need to bring it to a PC at school or transfer it to a friend who is only on a PC, can I put it onto a Flash Drive and do it that way? Does it work vice versa too (transfering files from a PC to flash drive, and flash drive to my MBP)? Thanks.