给海信电视分区做个备份（命令dd)

主要步骤就三步：
1 找到挂载分区，mount命令完成。
2 找到名字与分区对应关系，为使用dd命令准备。
    ls -al /dev/block/platform/hi_mci.1/by-name 这一长串从上面查到
3 找自己的移动硬盘挂载点，df命令
4 备份最简单了，按照上面对应关系，可把bootargs,baseparam,misc,recovery.fastboot,system等一起做dd ,命令类似：
    dd if=/dev/block/mmcblk0p10 of=/mnt/usbdisk/system10.img.20181220



这个需要adb shell 有管理员权限，是否必须未知。可能需要电视ｒｏｏｔ。
相关搜索关键字 adb.exe  adb用法  "adb connect" "adb shell" "adb install" 超级adb
root@Hi3751:/data # mount
mount
rootfs / rootfs ro,relatime 0 0
tmpfs /dev tmpfs rw,nosuid,relatime,size=750556k,nr_inodes=74142,mode=755 0 0
devpts /dev/pts devpts rw,relatime,mode=600 0 0
proc /proc proc rw,relatime 0 0
sysfs /sys sysfs rw,relatime 0 0
tmpfs /mnt tmpfs rw,relatime,size=750556k,nr_inodes=74142,mode=775,gid=1000 0 0
none /acct cgroup rw,relatime,cpuacct 0 0
none /sys/fs/cgroup tmpfs rw,relatime,size=750556k,nr_inodes=74142,mode=750,gid=1000 0 0
tmpfs /mnt/secure tmpfs rw,relatime,size=750556k,nr_inodes=74142,mode=700 0 0
tmpfs /mnt/asec tmpfs rw,relatime,size=750556k,nr_inodes=74142,mode=755,gid=1000 0 0
tmpfs /mnt/obb tmpfs rw,relatime,size=750556k,nr_inodes=74142,mode=755,gid=1000 0 0
/dev/block/platform/hi_mci.1/by-name/system /system ext4 ro,relatime,journal_checksum,commit=1,data=ordered 0 0
/dev/block/platform/hi_mci.1/by-name/userdata /data ext4 rw,nosuid,nodev,noatime,journal_checksum,data=ordered 0 0
/dev/block/platform/hi_mci.1/by-name/cache /cache ext4 rw,nosuid,nodev,noatime,journal_checksum,data=ordered 0 0
/dev/block/platform/hi_mci.1/by-name/atv /atv ext4 rw,nosuid,nodev,noatime,journal_checksum,data=ordered 0 0
/dev/block/platform/hi_mci.1/by-name/dtv /dtv ext4 rw,nosuid,nodev,noatime,journal_checksum,data=ordered 0 0
/dev/block/platform/hi_mci.1/by-name/tmp /tmp ext4 rw,nosuid,nodev,noatime,journal_checksum,data=ordered 0 0
/dev/block/vold/8:1 /mnt/usbdisk tntfs rw,dirsync,nosuid,nodev,relatime,uid=1000,gid=1015,umask=00,nls=utf8,min_prealloc_size=64k,max_prealloc_size=1953513556,readahead=4M,user_xattr,case_sensitive,reset_journal,fail_safe,hidden=show,dotfile=show,errors=continue,mft_zone_multiplier=1 0 0


root@Hi3751:/data # ls -al /dev/block/platform/hi_mci.1/by-name
ls -al /dev/block/platform/hi_mci.1/by-name
lrwxrwxrwx root     root              1970-01-01 08:00 atv -> /dev/block/mmcblk0p13
lrwxrwxrwx root     root              1970-01-01 08:00 baseparam -> /dev/block/mmcblk0p5
lrwxrwxrwx root     root              1970-01-01 08:00 bootargs -> /dev/block/mmcblk0p2
lrwxrwxrwx root     root              1970-01-01 08:00 bootmusic -> /dev/block/mmcblk0p16
lrwxrwxrwx root     root              1970-01-01 08:00 cache -> /dev/block/mmcblk0p15
lrwxrwxrwx root     root              1970-01-01 08:00 deviceinfo -> /dev/block/mmcblk0p4
lrwxrwxrwx root     root              1970-01-01 08:00 dtv -> /dev/block/mmcblk0p12
lrwxrwxrwx root     root              1970-01-01 08:00 fastboot -> /dev/block/mmcblk0p1
lrwxrwxrwx root     root              1970-01-01 08:00 kernel -> /dev/block/mmcblk0p8
lrwxrwxrwx root     root              1970-01-01 08:00 logo -> /dev/block/mmcblk0p7
lrwxrwxrwx root     root              1970-01-01 08:00 logoext -> /dev/block/mmcblk0p17
lrwxrwxrwx root     root              1970-01-01 08:00 misc -> /dev/block/mmcblk0p9
lrwxrwxrwx root     root              1970-01-01 08:00 panelparam -> /dev/block/mmcblk0p6
lrwxrwxrwx root     root              1970-01-01 08:00 recovery -> /dev/block/mmcblk0p3
lrwxrwxrwx root     root              1970-01-01 08:00 system -> /dev/block/mmcblk0p10
lrwxrwxrwx root     root              1970-01-01 08:00 tmp -> /dev/block/mmcblk0p14
lrwxrwxrwx root     root              1970-01-01 08:00 userdata -> /dev/block/mmcblk0p11


root@Hi3751:/data # df
df
Filesystem               Size     Used     Free   Blksize
/dev                   733.0M   164.0K   732.8M   4096
/mnt                   733.0M     0.0K   733.0M   4096
/sys/fs/cgroup         733.0M    12.0K   733.0M   4096
/mnt/secure            733.0M     0.0K   733.0M   4096
/mnt/asec              733.0M     0.0K   733.0M   4096
/mnt/obb               733.0M     0.0K   733.0M   4096
/system                991.9M   783.4M   208.4M   4096
/data                    2.1G   872.7M     1.2G   4096
/cache                  94.4M    44.0K    94.4M   4096
/atv                    15.7M    84.0K    15.6M   4096
/dtv                    74.7M     3.6M    71.1M   4096
/tmp                     5.8M   324.0K     5.5M   4096
/mnt/usbdisk          1863.0G  1240.2G   622.9G   4096


root@Hi3751:/data # dd if=/dev/block/mmcblk0p10 of=/mnt/usbdisk/system10.img.20181220
f=/mnt/usbdisk/system10.img.20181220                                          <
2097152+0 records in
2097152+0 records out
1073741824 bytes transferred in 33.486 secs (32065395 bytes/sec)