I made an image of my C: drive (boot drive) using Acronis true image 9.0 build 3,633. 7.43GB of data fit nicely on one DVD with 3.98GB of data compressed. When I made an image of my D: drive 3.12GB of data took two DVDs and used 6.87GB of space. I was careful to select only my D: drive in the process. I tried several times. I made the image of D: to my C: drive with the same results. When I mount the image that is saved on C: drive I see no extra files or data. (I could not mount the image that spand two DVDs. I had previously made a secure zone on my D: drive but removed it before this. I am running Windows XP home on an ASUS A8V motherboard and twin Seagate 80GB harddrives not in RAID.