I have a USB hard drive with a video that someone put on it for me. On his end, he connected the drive using a Mac, if that makes a difference. Anyway, when i plug it into my XP computer, no drive letter shows up. The drive is in the computer management area and shows up as a drive that is not initialized. If I initialize it, do I automatically lose the data on it? Or is that just a step I have to do for the drive letter to be assigned?