MBR (Master Boot Record) and GPT (GUID Partition Table) are two different ways of storing the partitioning information on a drive. This information includes where partitions start and begin, so your operating system knows which sectors belong to each partition and which partition is bootable.

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This article is about a PC-specific type of on partitioned media. For the first sector on non-partitioned media, see. A master boot record ( MBR) is a special type of at the very beginning of computer like or intended for use with systems and beyond. The concept of MBRs was publicly introduced in 1983 with.

The MBR holds the information on how the logical partitions, containing, are organized on that medium. 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, or in conjunction with each partition's (VBR). This MBR code is usually referred to as a. The organization of the partition table in the MBR limits the maximum addressable storage space of a disk to 2 (2 32 × 512 bytes).

Western digital wd2500d032-000 driver for mac. Approaches to slightly raise this limit assuming 33-bit arithmetics or 4096-byte sectors are not officially supported, as they fatally break compatibility with existing boot loaders and most MBR-compliant operating systems and system tools, and can cause serious data corruption when used outside of narrowly controlled system environments. Therefore, the MBR-based partitioning scheme is in the process of being superseded by the (GPT) scheme in new computers.

A GPT can coexist with an MBR in order to provide some limited form of backward compatibility for older systems. MBRs are not present on non-partitioned media such as, or other storage devices configured to behave as such. On such a superfloppy, the entire media is treated as a single partition.

Contents • • • • • • • • • • • • • • • Overview [ ] Support for partitioned media, and thereby the master boot record (MBR), was introduced with IBM 2.0 in March 1983 in order to support the 10 MB of the then-new, still using the file system. The original version of the MBR was written by David Litton of IBM in June 1982. The partition table supported up to four primary partitions, of which DOS could only use one. This did not change when was introduced as a new file system with DOS 3.0. Support for an, a special primary partition type used as a container to hold other partitions, was added with DOS 3.2, and nested logical drives inside an extended partition came with DOS 3.30.

Since MS-DOS, PC DOS, OS/2 and Windows were never enabled to boot off them, the MBR format and boot code remained almost unchanged in functionality, except for in some third-party implementations, throughout the eras of DOS and OS/2 up to 1996. In 1996, support for (LBA) was introduced in Windows 95B and DOS 7.10 in order to support disks larger than 8 GB. Disk timestamps were also introduced. This also reflected the idea that the MBR is meant to be operating system and file system independent. However, this design rule was partially compromised in more recent Microsoft implementations of the MBR, which enforce access for and partition types /, whereas LBA is used for /. Despite sometimes poor documentation of certain intrinsic details of the MBR format (which occasionally caused compatibility problems), it has been widely adopted as a de facto industry standard, due to the broad popularity of PC-compatible computers and its semi-static nature over decades.