master boot record(redirected from Partition sector)
master boot recordThe first sector on the hard disk, which contains a tiny program and the disk's partition table. When the program is executed, it determines which partition contains the active operating system and branches to the boot program in that partition's boot sector to load it. See boot sector.
Copyright © 1981-2019 by The Computer Language Company Inc. All Rights reserved. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction is strictly prohibited without permission from the publisher.