so i have been using pc all my life, but now i have a new macbook and ive been downloading a lot of things. the other day an error popped up and said i was running low on disk space... ive been lazy about "reconfiguring my external hard drive for my mac" like the apple employee told me i needed to do, but i decided i should finally do it to free up space on my computer. i have a seagate external hard drive and i plugged it into my computer and erased everything on it so i could start using it with time machine. after it started backing everything up an error popped up saying that i only have 2.2 MB available.... so on my system preferences i reconfirmed that it says 2.2 MB of 232.9 GB available. this doesnt make any sense because i just wiped my external drive, plus i didnt have much on it to begin with. so i guess my question is, how do i make that space available? also, i mainly wanted to back up all of my documents, music, and movies so that i could delete some movies and documents from my computer that i dont need every day and make space for more, but then when i plug my ext hard drive back in to my computer, wont it just mirror my computer with time machine and defeat the purpose of storing things on it because they will just be deleted? i know im lame, but im really trying to get used to my mac which i know is way easier than im making it out to be... PLEASE HELP!!!