Note: Naming the partition table entries as "1" through "4" is for convenience only. Each entry starts at a predetermined offset from the beginning of the sector, as follows: Each Partition Table entry is 16 bytes long, making a maximum of fourĮntries available. Standard layout that is independent of the operating system. Information about primary partitions and an extended partition is contained in a 64-byte data structure located in the MBR. The MBR, with 48 bit LBA fields for the partitions ( see below), but due to pressure from Microsoft the GPT won the battle. There were other proposed new standards for The successor to the MBR system is GPT (see below). To "overflow" when dealing with disks larger than 2Tb. Traditional MBRs are nearly obsolete at this time, because the 32 bit design of the LBA fields in the Partition Table begins (See the MBR article for the overall structure and contents of the MBR.)Īlmost all PCs still use an MBR for booting hard disks, and for storing partition information on hard disks. (cylinder 0, head 0, sector 1 - or, alternately, LBA 0) of the hard drive. That is, the Partition Table is contained inside the MBR, which is stored in the first sector The Master Boot Record is the traditional way of storing partition information about a hard disk, along with some boot code.
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