> if i have a byte-for-byte image file for the SD card, is it possible > to mount one of those internal filesystems? i'm well aware of the "-o > loop" option for mounting image files, but now i want to mount a > filesystem that's *inside* such an image file, so i can make changes > to it. > > can i do this? am i missing something stupidly obvious? > You can get the offset of the partition you want access to by running: parted sd_card.img Once you know the start offset of the partition you want, you can use mount with the offset option: mount -t ext3 -o loop,offset=your_start_offset sd_card.img /mnt/mountpoint If this method doesn't work for whatever reason, there are other ways listed here: http://www.andremiller.net/content/mounting-hard-disk-image-including-partitions-using-linux Good Luck, Jeremy Carter Linux+/LPIC-1 Certified Linux Administrator Algonquin College Certified UNIX Administrator jeremycarter.ca