You can use a disk utility to edit bytes in the MBR directly from the disk or You can use BCDedit in Vista and Windows 7 see links
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In Windows Vista or newer operating systems:# Right-click Computer in the Start Menu and then select Manage. # Select Disk Management in the left column. # Right-click the MBR drive you want to convert to GPT and then click Convert to GPT Disk. Note: If the drive contains partitions you must first delete these before converting it to GPT.
The Master Boot Record (MBR) is stored at the beginning of your hard drive (in the first 512 bytes.) The MBR contains information about the beginning and ending of each partition, which partition contains the operating system for booting, and other valuable information about the disk layout. Your computer will not boot up if your MBR is corrupt or missing.
The easiest method under Windows is using an application such as MBRWizard (link provided below), which can delete, create, or even repair a corrupt MBR.
A single MBR-Style disk can contain a maximum of four primary partitions.
MBR Master Boot RecordA Master Boot Record (MBR), or partition sector, is the 512-byte boot sector that is the first sector ("Sector 0") of a partitioned data storage device such as a hard disk. ( from: http://whitehouse.com)
Well, assuming you mean "Master Boot Record". The master boot record is a 512 byte strip of data on a disk which contains, along with a few other things, the partition table for the disk in question and the bootstrap info for the operating system AND the disk identification. The last one is not always used. The MBR is very important.
You can fix the MBR (Master Boot Record) on Microsoft Windows Vista in a number of ways. You can use your recovery disk with the /FixMBR option or use any number of free utilities available on CNET.
To correct a corrupt MBR or partition table, you can use command-line tools like "diskpart" in Windows or "fdisk" in Linux to rewrite the MBR or partition table. Another option is to use third-party disk management software that can repair or rebuild the MBR and partition table. Alternatively, restoring from a recent backup or reinstalling the operating system can also fix the issue.
It is just like every other sector on a hard disk, an area to store data, except for the fact that it contains the MBR (Master Boot Record).