backup_mbr_linux

[root@probe ~]# mkdir -p /var/backup
[root@probe ~]# dd if=/dev/sda of=/var/backup/mbrbackup bs=512 count=1

1+0 records in
1+0 records out
512 bytes (512 B) copied, 5.6701e-05 s, 9.0 MB/s
[root@probe ~]#