Linux MBR corruption and how grub configuration file corruption is fixed

System environment: RHEL5.8 VMware

One, analog MBR damage:

1. Backup Mbr:dd if=/dev/sda of=/root/mbr.txt count=1 bs=512

2. Damage Mbr:dd If=/dev/zero OF=/DEV/SDA count=1 bs=200

3.reboot

4. Disc Repair: VMware Setup starts from CD

5. Enter the start screen: Boot:linux rescue (input) and enter

6. Enter the system: Enter the command grub into the Grub interface:

Grub>root (hd1,0) #有可能是 (hd0,0) or other

Grub>setup (HD1)

Grub>quit

7.sync;reboot

Repair complete, reboot and set from local

Second, the analog/boot/grub/grub.conf configuration file is missing

1.mv/boot/grub/grub.conf/root #将此文件移走

2.reboot system will go directly to the Grub interface

3.grub>find (hd0,0)/Press the TAB key to try to find the partition where the system resides

Grub>root (hd0,0)

grub>kernel/vmlinuz-#按Tab键补全

grub>initrd/initrd-#按Tab键补全

Grub>boot

4. Successfully enter the system and repair the grub.conf file:

Linux MBR corruption and how grub configuration file corruption is fixed