System Backup :
[root@localhost ~]# mkdir /abc
[root@localhost ~]# mount /dev/sdb1 /abc
[root@localhost ~]# dd if=/dev/sda of=/abc/sda-mbr-bak bs=512 count=1
Recording the 1 + 0 read
Recording the 1 + 0 written
512 bytes (512 B) has been copied, .000224936 sec, 2.3 MB / sec
[root@localhost ~]# dd if=/dev/zero of=/dev/sda bs=512 count=1
Recording the 1 + 0 read
Recording the 1 + 0 written
512 bytes (512 B) has been copied, 0.000185039 sec, 2.8 MB / sec
system Restore:
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