1分钟
备份 MBR:dd if=_dev_sda of=_tmp_mbr.bak bs=512 count=1
备份MBR: dd if=/dev/sda of=/tmp/mbr.bak bs=512 count=1
破坏bootloader: dd if=/dev/zero of=/dev/sda bs=64 count=1 seek=446
修复bootloader: dd if=/tmp/mbr.bak of=/dev/sda bs=64 count=1 skip=446 seek=446
查看bootloader: hexdump -C /dev/sda -n 512
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