https://edu.aliyun.com/lesson_1731_14257?spm=5176.8764728.0.0.1794489a5ghnUJ#_14257
hexdump -C /dev/sda -n 512
dd if=/dev/sda of=dpt bs=1 count=64 skip=446 seek=446 ibs,obs,输入输出块
dd if=/dev/sda of=dpt bs=1 count=64 skip=446 跳过输入的446个字节
scp dpt 192.168.34.6:/data
dd if=/dev/zero of=/dev/sda bs=1 count=64 seek=446
dd if=dpt of=/dev/sda bs=1 count=64 seek=446
sync
vim -b 编辑二进制文件