I have tried with two different external 1 TB USB drives, and with both I get the same error, and creating the backup fails. Attached are the pictures where it asks to define some file names for the backup item AFTER its been doing the backup pre-windows boottime for an hour already and is near finishing it.. I choose in the settings to NOT split the image into 4gb files, so it shouldn't even ask for this? This same happens even if i choose to split into 4gb files. when I click cancel it gives the ERROR screen shown in the picture, and the target HDs got far over 500Gb free space,so that's not correct either. This is the version you just gave out on GOTD (Giveawayoftheday) the other day. Is this a bug,or am I doing something wrong there? The backups I'm trying to do are RAW image (all sectors) on my C (windows) drive ..