$ su
# apt-get install p7zip
# mkdir /var/images
# cat /proc/partitions
major minor #blocks name
179
0 7782400 mmcblk0
179
1 7781376 mmcblk0p1
179
16 7634944 mmcblk1 → これがあることを確認する
179
17 7633920 mmcblk1p1
179
48 4096 mmcblk1boot1
179
32 4096 mmcblk1boot0
# dd if=/dev/mmcblk1 bs=10M | 7zr a -bd -t7z -m0=lzma
-mx=9 -mfb=64 -md=32m -ms=on -si /var/images/emmc.img.7z
# ls -l /var/images/
total 234656
-rw-r--r-- 1 root root 240284000 Jun 23 00:34 emmc.img.7z
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