Repair the faulty sector

Catalog

Repair the faulty sector

Repair MBR Sector failure

GURB Sector failure

forget root password

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Repair the faulty sector

1、 The cause of the problem

Viruses 、 Damage caused by Trojans, etc

Incorrect partition operation 、 Disk read / write misoperation

2、 The fault phenomenon

Bootloader not found , Start interrupt

Unable to load operating system , Black screen after power on

3、 Solutions

Backup files shall be prepared in advance

Use the installation CD to guide you into emergency mode

Repair from backup file

4、 Operation steps

Eliminate startup faults

Repair MBR Sector failure

1、 First, create a folder . take sdb1 Mount to this directory

 

 2. take sda Backup the information of the normal startup system in the disk , Then overwrite with garbage files sda in , Manufacturing post fault

 

 3. In case of failure during startup, enter the first aid mode Troubleshooting, Then enter Rescue a CentOS system

4、 choice 1）coutinue

 5. Then create a new directory , take sdb1 Mount to this directory , Write the previously backed up post information into sda in , Press next exit Restart to enter the system normally

GURB Sector failure

1、 Create a new directory , And will sdb1 Format and mount it

 2. manufacture GRUB Sector failure

 3. Enter first aid mode , Load the disc image , Switch to the system root environment , Re grub The boot program is installed on the first disk mbr A sector , Rebuild grub Menu profile , restart

forget root password

1. Enter first aid mode ,chroot /mnt/sysimage And then directly passwd root