I have a SimpleDrive 500 GB external hard drive. and i have a nice new macbook. when i try to add a folder from my documents folder on my mac to my simpledrive hard drive, it won't let me. when i click on "get info" for the hard drive, it says "you can only read" under sharing & permissions. i can't figure out how to get it so i can edit as well. please help if you can, i searched this forum and google and couldn't find any answers.