I have Windows Xp Home, and I really need to get one of my files from my computer to another computer in a different house. The file is an .mdf file and it's only 4.06 GB. So I tried to burn it onto a DVD, but it only reads as 72 MB. I also used xdrive.com and tried to upload it onto there temporarily, but it still is being read as 72 MB. What's the problem?