Is it okay if I work with large photoshop/illustrator/quark files off my external hard drive or should I copy it to my laptop hard drvie and work on the files from there? could someone tell me the point of partitioning an external hard drive? i've done a search and read previous threads but i'm confused by the whole thing still. external hard drive is 300 gb and will be used for storing my music/pictures/design projects.. should i partition 80 gb of it for backing up my laptop hard drive? and if i do.. do i use a utility tool or something to copy/backup to the external?