Answer / mrunal

MBR is Master Boot Record.
It is the first 512 bytes of active partition on an HDD.

To clear MBR I know of the foll command in linux
dd if=/dev/null of=/dev/hda1 bs=512 count=1

Answer / rajan bhargava

A master boot record (MBR) is a type of boot sector
popularized by the IBM Personal Computer.[1] It consists of
a sequence of 512 bytes located at the first sector of a
data storage device such as a hard disk. MBRs are usually
placed on storage devices intended for use with IBM
PC-compatible systems.

for clear MBR, do the following

Boot with the XP installation CD.

When prompted, press R to repair a Windows XP installation.

If repairing a host with multiple operating systems, select
the appropriate one (XP) from the menu. If you have only one
operating system, enter 1 to select it.

Enter the administrator password if prompted.

To fix the MBR, use the following command:

fixmbr

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