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What (who) is boot record - definition

PORTION OF DISK SPACE CONTAINING THE DEFAULT OPERATIONS.

Bootsector; Boot Sector; Boot record; Boot Record; Boot block

boot block

<operating system> A program at some fixed location on a {hard disk}, floppy disk or other media, which is loaded when the computer is turned on or rebooted and which controls the next phase of loading the actual operating system. The loading and execution of the boot block is usually controlled by firmware in ROM or PROM. (1997-07-03)

Volume boot record

BOOT SECTOR OF NON-PARTITIONED MEDIA IN IBM PC COMPATIBLE SYSTEMS

Volume Boot Record; Partition Boot Record; VBR boot signature; VBR invocation; Partition Boot Sector; Partition boot sector; Partition boot record; Volume boot sector; Volume Boot Sector

A volume boot record (VBR) (also known as a volume boot sector, a partition boot record or a partition boot sector) is a type of boot sector introduced by the IBM Personal Computer. It may be found on a partitioned data storage device, such as a hard disk, or an unpartitioned device, such as a floppy disk, and contains machine code for bootstrapping programs (usually, but not necessarily, operating systems) stored in other parts of the device.

https://en.wikipedia.org/wiki/Volume_boot_record

Extended boot record

SUBSIDIARY PARTITION TABLE IN THE MBR PARTITIONING SCHEME

Extended partition; Extended Boot Record; Extended partition boot record; EPBR; Extended partition bootstrap record; Extended bootstrap record; Extended Partition Boot Record; Extended Partition Bootstrap Record; Extended Bootstrap Record

An extended boot record (EBR), or extended partition boot record (EPBR), is a descriptor for a logical partition under the common DOS disk drive partitioning system. In that system, when one (and only one) partition record entry in the master boot record (MBR) is designated an extended partition, then that partition can be subdivided into a number of logical partitions.

https://en.wikipedia.org/wiki/Extended_boot_record

Wikipedia

Boot sector

A boot sector is the sector of a persistent data storage device (e.g., hard disk, floppy disk, optical disc, etc.) which contains machine code to be loaded into random-access memory (RAM) and then executed by a computer system's built-in firmware (e.g., the BIOS).

Usually, the very first sector of the hard disk is the boot sector, regardless of sector size (512 or 4096 bytes) and partitioning flavor (MBR or GPT).

The purpose of defining one particular sector as the boot sector is inter-operability between firmware and various operating systems.

The purpose of chainloading first a firmware (e.g., the BIOS), then some code contained in the boot sector, and then, for example, an operating system, is maximal flexibility.

https://en.wikipedia.org/wiki/Boot sector