Hi, this is my first time to post on here (and I am a little technologically unsaavy) so please bear with me. Yesterday morning, I got a computer error that led me to taking my computer into Office Depot for repair. The techs diagnosed that my OS system (Windows XP) was in failure and that it needed to be reinstalled. I gave them my external hard drive to back up my PC data to and left it overnight for them to work on. I got a call today and they told me they had everything backed up and were ready to restore, but when they told me they were going to put EVERYTHING that was on my external HD back onto the PC, I told them not to and that I could do that myself since I had LOTS of files/folders that I didn't want on my PC (video files, digital scrapbooking files, etc.) because they take up so much space. When I picked up everything this evening and got home, I immediately went into the external HD to see what was there and immediately noticed that while my data from the PC was on there, the data that was originally on the external HD had disappeared!! I ran a free file recovery program on it that I'd had success with in the past and if found NOTHING!! The techs at the store assure me that they did not delete anything and that I can bring it back in on Monday and they can run a sophisticated recovery program on it that "might" be able to recover the lost data......I am just sick. My questions are: 1) How could the data originally on there have disappeared yet the data transferred from the PC still be on there? 2) Is there something I can do at home to give me any foresight/reassurance about the problem? 3) Is it likely that a free recovery software wouldn't recognize any deleted files and that their's will? 4) Can I fix this myself?