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Consequently, a different partitioning scheme must be used for larger disks, as they have become widely available since 2010. Therefore, the maximum disk size supported on disks using 512-byte sectors (whether real or emulated) by the MBR partitioning scheme (without using non-standard methods) is limited to 2 TiB. Sometimes this was in addition to other pre-existing or standards for bootstrapping and partitioning.MBR partition entries and the MBR boot code used in commercial operating systems, however, are limited to 32 bits.
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This was even to the extent of being supported by computer operating systems for other platforms. 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. This also reflected the idea that the MBR is meant to be operating system and file system independent.
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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. 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. This did not change when was introduced as a new file system with DOS 3.0. The partition table supported up to four primary partitions, of which DOS could only use one. The original version of the MBR was written by David Litton of IBM in June 1982.
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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.
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