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Alleviating this capacity limitation is one of the prime motivations for the development of the GUID Partition Table (GPT). Because the block size is 512 bytes, this implies that neither the maximum size of a partition nor the maximum start address (both in bytes) can exceed 2 32 × 512 bytes, or 2 TiB. Both the partition length and partition start address are stored as 32-bit quantities. īy convention, there are exactly four primary partition table entries in the MBR Partition Table scheme, although some DOS operating systems did extend this to five (PTS-DOS) or even eight (AST or NEC DOS) entries. The partition table entries for other, secondary partitions are stored in extended boot records (EBRs), BSD disklabels, and Logical Disk Manager metadata partitions that are described by those primary entries.
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When a data storage device has been partitioned with the MBR Partition Table scheme (i.e., the conventional IBM PC partitioning scheme), the master boot record contains the primary partition entries in its partition table. The MBR is not located in a partition, it is located at a Main Boot Record area in front of the first partition. Number of blocks in partition, in little-endian format Sector is in bits 5–0 bits 9–8 of cylinder are in bits 7–6 Sector is in bits 5–0 bits 9–8 of cylinder are in bits 7–6ĬHS address of last block in partition. The format is described in the next 3 bytes. Status (0x80 = bootable, 0x00 = non-bootable,ĬHS address of first block in partition. MBRs and disk partitioning Layout of one 16-byte partition record Offset ĭue to the broad popularity of IBM PC-compatible computers, this type of MBR is widely used, to the extent of being supported by and incorporated into other computer types including newer cross-platform standards for bootstrapping and partitioning.
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