LinuxDig.com : Linux Dictionary Term mbr

1. Master Boot Record for IBM-PC compatible computers. This is used in booting Linux from the hard disk. The MBR runs first, then transfers control to LILO, which transfers control to the Linux kernel. From Debian 3.0r0 APT

Source:
Linux Dictionary (version 0.12)
author: Binh Nguyen
linuxfilesystem(at)yahoo(dot)com(dot)au

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2. master boot record - The first sector of the disk; this is the sector that the BIOS reads in and starts when the machine is first booted. The master boot record contains a small program which reads the partition table, checks which partition is active (that is, marked bootable), and reads the first sector of that partition, the partition's boot sector. From Linux Guide @FirstLinux