Hi, the main part of this wish is already fulfilled, but only for overwritable media. Image files are considered such media. So you can use command -truncate_overwritable .
Examples from the man page: Activate session 4 and enable overwriting of the blocks of younger sessions: -truncate_overwritable session 4 new Activate session 4 and claim the blocks of younger sessions as useless part of session 4: -truncate_overwritable session 4 old Let session 4 claim additional 500 MiB as useless data: -truncate_overwritable session 4 +500m See also the longish explanation in the man page. But this command does not truncate the image file size. You will have to use command -toc afterwards to learn the block address where the next session would be written. E.g.: Media nwa : 1374720s means that the data after byte 1374720 * 2048 = 2815426560 are not claimed by the remaining sessions in the ISO image. This number can be used with truncate(1) option -s. Have a nice day :) Thomas
