Hey, I got a Western Digital 1TB Essential Edition external hard drive that I'm going to return to Best Buy today because it's been messing up my iMac. I pretty much have two questions: 1. How do I get all the files off? What disk wipe programs can I use? Also, if I do a disk wipe will I delete some important software on the external hard drive? 2. What is a good hard drive to get? I do a lot of video editing and music composition so I need something really fast. Thanks in advance!