Use dd to clone used content on sd card to an image? - Raspberry Pi Forums

there many options, clone whole image or use rpi-clone

idea use command:
"sudo dd bs=4m count=? if=/dev/mmcblk0 of=/mnt/pi_test.img"
need work out "count".

have @ picture of gparted of sd card. use raspi-config
expand full sd card.


step 1:
used content = 4m + 56m + 2700m = 2760m, think make 3g should enough.

step 2:
need use command
"sudo dd bs=4m count=? if=/dev/mmcblk0 of=/mnt/pi_test.img", need
work out "count"

4 * 1000 * 1000 * count = 3 * 1000 * 1000 * 1000, count = 750

step 3:
final command use:

sudo dd bs=4m count=750 if=/dev/mmcblk0 of=/mnt/pi_test.img

result:
booted, seems missing something, cannot startx, prompt
shows pi@(none)

if don't use count=nnnn dd copy start end of input file.

raspberrypi