i have a 250gig external hard drive that i'll connect to my mbp and the only "permission" i have on it is read, but when i hook it up to my dell laptop i can do whatever the heck i want. also i can network over to the external hard drive from my mbp through our school network to my dell and then into the ext-hard drive.... and when i do that i have read and write permissions. but going that route is rediculously complicated and slow (especially since my dell sucks, pos inspirion 9100). anyway i tried going into the disk utility when i had it connect by firewire to my mbp but all the options under "first aid" are greyed out, so i wasnt able to try and "repair disk permissions". also ive tried editing preferences w/ the ext-hard-drive through my dell but there is nothing there to change for access permissions. i really dont know what to do... the only thing i can think is maybe it has something to do w/ the jumper on the drive, but thats a really left field thought. i really dont want to have to reformat it either since i have over 170gig of stuff on it.... (70 gig of that is music). any suggestions or solutions?