New user not sure if this fits here but anyway... I have a WD external hard drive. I was told that it could operate between mac and windows, which i need to do for school. (best buy guy said all i need to do is format it) I had been using it fine for awhile on windows but then i needed to put something from my mac on it. It showed up per normal but when i tried to save something to it, it wouldn't let me. So i decided to get my files and put them on my desktop and format it. Everything went fine, i put my files back on and ejected the disk. I tested to see if the file would show up on my dads windows laptop. I heard the alert that it new something was plugged in but it wont show up in "my computer". I'm assuming it's not showing up because i formatted it to my mac, fair enough the guy at best buy was mistaken or i didn't do something right. but problem is i can't format it back to windows, or at least I don't know how. Does ANYONE know how to fix this? And please go easy with short forms and **** cause I'm fairly new to this.