On Thu, May 14, 2020 at 03:38:37PM -0400, Lennart Sorensen via talk wrote:
* Loop mount, e.g. 'mount -o loop,offset=$((512 * xxxx)) RG350.SD.2020-05-14.img tmp/' where xxx is the number of, e.g., 512-byte sectors
If you enable partition support on your loop driver you don't need to deal with the offset calculations and such. It is unfortunately not enabled by default for legacy reasons I believe.
modprobe -r loop modprobe loop max_part=16
Then losetup /dev/loop0 imagefile
and you should have /dev/loop0p1 /dev/loop0p2 etc.
If the filesystem is ext based, zerofree is a nice tool to zero unused space that seems to run faster than using dd and rm with a zero filled file.
I had to do this kind of thing before, but I don't remember loading "loop" module with options. I think "losetup" does it or with some options. -- William Park <opengeometry@yahoo.ca>