I'm using the Seagate DiscWizard version of ATI and doing my first image backup C: to G: C has total capacity of 229 GB, with 75GB used, 154GB free. When I get to the "proceed" step it says: "Create full image backup from C to G." Then "Operation 1 of 2 Saving partition structure hard disc 1." Then "Operation 2 of 2 Creating partition image hard disc 1 drive letter C, file system NTFS, Volume label [blank], size 229.5G." This is confusing me. It sounds like it's going to image the full partition 229.5 GB, but how can it image more than the 75GB of used space? I have only 117GB free on G: using normal compression. About 40% of the 75GB I want to image is photo, music and video files. About what size would the .tib be with normal compression? Thanks much for your insights.