BACKGROUND
The loop device is available in Ubuntu and is the first step to processing the rPi image with zerofree
.
The goal is to reproduce the UBUNTU example with OSX High-Sierra:
UBUNTU example
Raspberry Pi image successfully mounted to /dev/loop9p2:
$ sudo losetup -P /dev/loop9 rpi4_Ubuntu18.1_64GB.image
$ ls -l /dev/loop9*
brw-rw---- 1 root disk 7, 9 Feb 2 19:12 /dev/loop9
brw-rw---- 1 root disk 259, 0 Feb 2 19:12 /dev/loop9p1
brw-rw---- 1 root disk 259, 1 Feb 2 19:12 /dev/loop9p2
zerofree required sudo
:
$ sudo zerofree -v /dev/loop9p2
14346339/14348998/15073019
- 14346339 number of nonzero blocks encountered
- 14348998 number of free blocks within the filesystem
- 15073019 total number of blocks within the filesystem
QUESTIONS
- Does OSX have an equivalent for a loop device?
- What are the OSX equivalents for
losetup
(brew commands are an option)?
I will save zerofree equivalent questions for a future posting