备份MBR分区表

备份MBR

dd if=/dev/sda1 of=/root/mbrinfo bs=512 count=1

恢复MBR

dd if=/root/mbrinfo of=/dev/sda1 bs=512 count=1

恢复分区表

dd if=/root/mbr of=/dev/sda1 bs=1 skip=446 seek=446 count=64

seek：skip BLOCKS obs-sized blocks at start of output

skip：skip BLOCKS ibs-sized blocks at start of input