Hello, I recently bought an Al Imac and am really excited to use time machine on leopard. I have an old Microsystem ext. HD and it is locked for some reason. I used to use it on an laptop that had xp. My question is: is there any way to reformat the disk so I could use it on my Imac? When I get info from HD, it says NTFS and that I only have permission to read. Someone please help, I can't stand the fact that my iMac can't use time machine on my ext. HD. thanx.