Create a disk image for cloning SD cards

SEE THIS https://www.raspberrypi.org/forums/viewtopic.php?f=26&t=5947&start=25

(This one is not so clean: https://www.youtube.com/watch?v=8afcs4y9Igs)

Get the list of disks;

➜  ~ df
Filesystem     1K-blocks      Used Available Use% Mounted on
udev             8115268         0   8115268   0% /dev
... etc...
/dev/mmcblk0p1     43436     22136     21300  51% /media/batman/boot
/dev/mmcblk0p2  61341180   4539376  54292404   8% /media/batman/rootfs

My final command: sudo dd if=/dev/mmcblk0 of=backup.img bs=1M count=22000 status=progress

Result: 23.1 GB. Therefore, dd uses bs=1M to be 1024*1024 bytes.

Use dd to create the image. Drop the p1 from the source to get both partitions; sudo dd bs=4M if=/dev/mmcblk0 of=output_img.iso

Add the status=progress option, or run sudo kill -USR1 $(pgrep ^dd) (this makes dd show the progress!).

Mount the image as loop device. sudo losetup /dev/loop0 output_img.iso Inform the OS of partition table changes sudo partprobe /dev/loop0 Start the gui sudo gparted /dev/loop0 Resize the image at loop0, apply.

dd if=/dev/YOUR_SD_CARD of=/home/YOUR_USERNAME/Desktop/backup.img bs=1m count=1024