![]() See MBRs and system bootstrapping and first-stage boot loader: on i386 systems, this code chainloads the second-stage boot loader, stored on the volume boot record of the active partition, which does the actual booting of the operating system. In a BIOS system, this is the first code executed when the BIOS boots from a drive. The boot loader code stored in that location. See Wikipedia's MBR article for details on the structure of a typical MBR. This location holds the first 440 bytes of boot loader code (the first-stage boot loader) and the primary partition table. ![]() The term Master Boot Record is often used to refer to two things - it is properly only the first, and commonly misapplied to the second:Ī location, specifically, the first 512-byte sector of a partitioned data storage device ("LBA Sector 0"). Without one, you will be unable to boot from that drive, and you will not be able to create partitions on that drive. ![]() Wil's answer is vaguely correct, but isn't technically accurate.
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