how to repair mbr

I. repair MBR: MBR (master boot record of MasterBootRecord): the hard disk has 0 cylinder, 0 Head, and 1 sector as the main boot sector. Among them, 446Byte is bootloader, 64Byte is Partitiontable, and the remaining 2Byte is m 1. repair MBR:

Grub manual boot, repair win7 Mbr I. Boot Linux to enter the grub menu interface, press the "c" key to enter the grub command mode. 1. Specify the partition where/boot is located. For example, the partition is the first partition of the first hard disk, that is, hd0, 0 grub> root (hd0, 0). 2. Specify the kernel, find the vmlinuz file. Grub> kernel/vmlinuz www.2cto.com Note: if the file is not in the root di

ReproducedFirst, repair MBR:MBR (master boot record main boot recording):The hard disk's 0 cylinders, 0 heads, and 1 sectors are referred to as the primary boot sector. Where 446Byte is bootloader,64byte for partition table, and the remaining 2Byte is magic number.Backup MBR:#dd IF=/DEV/SDA Of=/root/mbr.bak count=1 bs=512Destroy Bootloader:#dd If=/dev/zero OF=/DEV/SDA count=1 bs=200Here the block size as lo

Repair MBR Tools Mbrfix downloadInstalled Linux system friends, have had this experience, install GRUB, the hard disk MBR modified, but when the removal of Linux, but even the original Windows system can not start, how to do? There are two simple ways to write an MBR The 1th method is to put the Windows installation di

the partition, the CHS parameter computed from the start sector is different from the partition, the CHS parameter is recalculated and the disk is populated with the MBR, and the disk can be started.After many experiments, the following conclusions are drawn:1: The system at boot will check the CHS parameter in the MBR and the BPB parameter of the boot partition is correct, but it is not always the case, a

". The former refers to the partition name, and the latter tells us that Is a partition formatted in a Windows operating system. According to this, we know that your windows partition exists. The first partition on your hard disk SDA. The hard disk sda mbr is exactly what you want to fix. Next, we need to repair the/dev/sda mbr and input it in the terminal. Copy

Add a hard disk to the virtual machine to back up the information for the MBRFdisk-l See if the hard drive system knowsFdisk/dev/sdb to PartitionFdisk-l See if the partition is outMkfs-t EXT4/DEV/SBD1 for formattingMkdir/backupMount/dev/sb1/backup Mount to BackupDo a backup before destroying the MBR, back up the system with:DD IF=/DEV/SDA Of=/backup/sda.mbr.bak bs=512 count=1 back up the SDA front 512 bytes to the backup directoryLs/backup to see if t

the installation success.After installation, you can see the Grub directory already in the/boot directory.The final step is to manually create the grub.conf file in the Grub directory with the following file contents:650) this.width=650; "src=" Http://s5.51cto.com/wyfs02/M02/86/F9/wKiom1fP-f7zGYxRAAANoNCIVCI335.png "title=" 4.png " alt= "Wkiom1fp-f7zgyxraaanoncivci335.png"/>Where kernel that line if the root filesystem is on a logical volume, you should use the name of the logical volume instea

computer or on an FTP server by:A. Partitioning, formatting, and mounting another hard drive: fdisk/dev/sdb;mkfs.ext4/dev/sdb1;mount/dev/sdb1/mntB. SCP to another computer or upload an FTP server (step slightly)DD if=/dev/sda of=/mnt/dpt.bak skip=446 bs=1 count= //(2) Destroy DPTDD if=/dev/zero of=/dev/sda seek=446 bs=1 count=Error 22 Errors When restarting after ===> is destroyed(3) Restore dpt===> into rescue mode(Note: Because SDA does not have a disk partition, the hard disk system does no

Article Title: repair MBR after ghostFreeBSD recovers. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. Fix bsd startup 1. Use the FreeBSD boot CD to start the FreeBSD Fixit console. Various system tools can be used in this console-these system tools are located on the

Configuration:System: win7 + Ubuntu dual-System Computer: Sony Cause: After windows 12.04 and Ubuntu are installed, Ubuntu has some problems, so I want to reinstall ubuntu. I used the easybcd software to install the dual-system, because I did not know about the software and system, and so on. I just thought about it. Do I think Sony has any built-in recovery software? I can fix the entire hard disk and restore the system to the factory status. So I did it. As a result, there is a tragedy

Motivation: Dual-system grub repair MBRPrerequisites: Ubuntu 9.04. Other System methods are similar.Applicable: Windows and Linux dual systems are installed on different partitions, And the Linux boot program grub is installed on MBR by default.Problem description: Linux cannot be started because grub in MBR is damaged after Windows is reinstalled.Implementation:

only destroys the front 446 bytes, repairs grub, and the rear partition does not moveDestroying the native bootloader[[emailprotected] mnt]# dd if=/dev/zero of=/dev/sda bs=200 count=1[[emailprotected] grub]# syncThere are several ways to fix the boot state1. Using Grub-install Tools [[emailprotected] mnt]# grub-install --root-directory=/ /dev/sda 2. Grub Tool grub> root (hd0,0)root (hd0,0) Filesystem type is ext2fs, partition type 0x83grub> setup (hd0)setup (hd0) Checking if "/boot/grub/stag

Grub is the management setting for Linux * users to open the machine. In ubuntu, these resources are placed under/boot/GRUB/object. It is often seen on the Internet that grub crashes (it should be said that MBR crashes) and cannot be opened, sometimes it is caused by installing windows after ubuntu. How can I fix this phenomenon? MBR crash (if you do not know about