I picked up a WD My Passport 1TB the other day and at first tried to use it to back up my macbook air and realized that it wouldn't backup to exFAT. I want to use it for both my pc desktop and macbook air. I plugged it into the PC and restored the defaults. Now when i open the properties and try to reformat it there is nothing in the drop down list. I've tried running a command that i found on another post in the cmd prompt and it told me that it was reformatting and then got stuck at 0%. Any ideas?