I have a user which having problem after removing CentOS partition (using partition manager) in a dual boot PC with Windows Vista. The problem rise after that and Windows Vista simply unable to boot due to missing MBR. Since I have no Windows Vista installation disc anymore with me, I need to use some other way in order to fix the MBR.

Luckily I have the Ubuntu Live CD ISO which I have downloaded several days ago. The idea is boot into LiveCD, use a tool called ms-sys in Ubuntu and fix the MBR right away.

1. Get Ubuntu Desktop Live CD from Ubuntu download page here: http://www.ubuntu.com/download.

2. Download UNetbootin from here. We will use this application to burn our ISO into flash drive.

3. Prepare our flash drive. Format it to FAT32 file system. Since I am using Windows 7, just right click to the drive and click ‘Format’.

4. Launch UNetbootin and select ‘Diskimage’. Locate the ISO file in your PC and click OK as screenshot below:

 

5. Download ms-sys from http://ms-sys.sourceforge.net/ . I will the most stable version which is  2.2.1. Extract it and put it into the flash drive together with the Ubuntu Live CD as screenshot below:

 

6. Now we have enough tools to start the recovering process. Go to the problematic PC and boot from USB. Select “Try Ubuntu without installing” and make sure Ubuntu Live CD is booted up until the desktop page.

 

7. Open terminal. Go to Dashboard icon and type “terminal” to open it. We need to copy ms-sys directory into the local disk and build it:

$ cp /cdrom/ms-sys ~ -Rf
$ cd ~/ms-sys
$ sudo make

8. Run following command to analyze your disk partition:

$ sudo fdisk -l | grep /dev
Disk /dev/sda: 160.0 GB, 160041885696 bytes
/dev/sda1              16    12288527     6144256   12  Compaq diagnostics
/dev/sda2   *    12288528    96175455    41943464    7  HPFS/NTFS/exFAT
/dev/sda3        96175456   312577823   108201184    7  HPFS/NTFS/exFAT
Disk /dev/sdb: 4007 MB, 4007657472 bytes
/dev/sdb1   *         128     7827455     3913664    b  W95 FAT32

The Windows installation is located in the disk that have NTFS. In this case, it will be /dev/sda.

9. Navigate to the bin directory under ms-sys as below and install the MBR using following command:

$ cd ~/ms-sys/bin
$ sudo ./ms-sys --mbrvista /dev/sda

Done! You can now reboot the PC and remove the USB drive. Your Windows Vista should able to load after that.

Notes

Other options that can be use with ms-sys:

$ ./ms-sys 
Usage:
	./ms-sys [options] [device]
Options:
    -1, --fat12     Write a FAT12 floppy boot record to device
    -2, --fat32nt   Write a FAT32 partition NT boot record to device
    -3, --fat32     Write a FAT32 partition DOS boot record to device
    -4, --fat32free Write a FAT32 partition FreeDOS boot record to device
    -5, --fat16free Write a FAT16 partition FreeDOS boot record to device
    -6, --fat16     Write a FAT16 partition DOS boot record to device
    -l, --wipelabel Reset partition disk label in boot record
    -p, --partition Write partition info (hidden sectors, heads and drive id)
                    to boot record
    -H, --heads <n> Manually set number of heads if partition info is written
    -7, --mbr7      Write a Windows 7 MBR to device
    -i, --mbrvista  Write a Windows Vista MBR to device
    -m, --mbr       Write a Windows 2000/XP/2003 MBR to device
    -9, --mbr95b    Write a Windows 95B/98/98SE/ME MBR to device
    -d, --mbrdos    Write a DOS/Windows NT MBR to device
    -s, --mbrsyslinux    Write a public domain syslinux MBR to device
    -z, --mbrzero   Write an empty (zeroed) MBR to device
    -f, --force     Force writing of boot record
    -h, --help      Display this help and exit
    -v, --version   Show program version
    -w, --write     Write automatically selected boot record to device
 
    Default         Inspect current boot record

This tutorial is also applicable to fix MBR for other Windows platform as stated in the command options above.

2 Responses to Fix Windows MBR using Ubuntu Live CD (USB)

  1. Martin JNo Gravatar says:

    Fabulously easy to follow. I love (ubuntu) linux more and more! Thank you.

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