Hi there, I just bought a new external hard drive and backed-up my computer onto it. Then today I realized that I didn't format the drive. All I did was follow instruction for hooking it up. Also, I'm a Mac user. Is it customary to do a full and proper format of newly purchased external hard drives? The most I did was verify the disk in disk utility when I first plugged in the HD to my computer. Is that enough? Thank you, S P.S. Yes, I'm a n00b.