I use Acronis True Image Home 10 and Windows XP Professional SP 3. I did a full backup of C: partition to my external USB drive. If I doubleclick on the tib file, it seems to be empty, but the file is more than 15 GB big. The file is correct, I can mount the file, but it is not possible to explore it with windows explorer. If I copy the file to the local disk, everything works fine. Thanks for help.