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The code in volume boot records is invoked either directly by the machine's firmware or indirectly by code in the master boot record or a boot manager. Code in the MBR and VBR is in essence loaded the same way. Invoking a VBR via a boot manager is known as chain loading.
Note: The column MBR (Master Boot Record) refers to whether or not the boot loader can be stored in the first sector of a mass storage device. The column VBR (Volume Boot Record) refers to the ability of the boot loader to be stored in the first sector of any partition on a mass storage device.
The MBR also contains executable code to function as a loader for the installed operating system—usually by passing control over to the loader's second stage, or in conjunction with each partition's volume boot record (VBR). This MBR code is usually referred to as a boot loader.
The first reserved sector (logical sector 0) is the Boot Sector (also called Volume Boot Record or simply VBR). It includes an area called the BIOS Parameter Block ( BPB ) which contains some basic file system information, in particular its type and pointers to the location of the other sections, and usually contains the operating system's boot ...
The MBR sector may contain code to locate the active partition and invoke its volume boot record. A volume boot record (VBR) is the first sector of a data storage device that has not been partitioned, or the first sector of an individual partition on a data storage device that has been partitioned. It may contain code to load an operating ...
In computing, the BIOS parameter block, often shortened to BPB, is a data structure in the volume boot record (VBR) describing the physical layout of a data storage volume. On partitioned devices, such as hard disks, the BPB describes the volume partition, whereas, on unpartitioned devices, such as floppy disks, it describes the entire medium ...
Different operating systems use different boot disk contents. All boot disks must be compatible with the computer they are designed for. MS-DOS/PC DOS/DR-DOS. A valid boot sector in form of a volume boot record (VBR) IO.SYS or IBMBIO.COM; MSDOS.SYS or IBMDOS.COM; COMMAND.COM; All files must be for the same version of the operating system.
Variable bitrate, in telecommunications and computing, a non-constant sound or video encoding bitrate; Volume boot record, in computer disks, a type of boot sector that contains code for bootstrapping programs