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fdisk is a command-line utility for disk partitioning.It has been part of DOS, DR FlexOS, IBM OS/2, and early versions of Microsoft Windows, as well as certain ports of FreeBSD, [2] NetBSD, [3] OpenBSD, [4] DragonFly BSD [5] and macOS [6] for compatibility reasons.
The MBR partitioning scheme is therefore in the process of being superseded by the GUID Partition Table (GPT). The official approach does little more than ensuring data integrity by employing a protective MBR. Specifically, it does not provide backward compatibility with operating systems that do not support the GPT scheme as well.
The partition type (or partition ID) in a partition's entry in the partition table inside a master boot record (MBR) is a byte value intended to specify the file system the partition contains or to flag special access methods used to access these partitions (e.g. special CHS mappings, LBA access, logical mapped geometries, special driver access, hidden partitions, secured or encrypted file ...
The total data storage space of a PC HDD on which MBR partitioning is implemented can contain at most four primary partitions, or alternatively three primary partitions and an extended partition. The Partition Table, located in the master boot record, contains 16-byte entries, each of which describes a partition.
This is referred to as a protective MBR. [ 10 ] A single partition of type EEh , encompassing the entire GPT drive (where "entire" actually means as much of the drive as can be represented in an MBR), is indicated and identifies it as GPT.
There are many disk editors that can modify the boot flag, such as Disk Management in Windows, [5] GPartEd in Linux, and fdisk. Some BIOSes test if the boot flag of at least one partition is set, otherwise they ignore the device in boot-order. Therefore, even if the bootloader does not need the flag, it has to be set to start the boot code from ...
The MBR sector may contain code to locate the active partition and invoke its volume boot record. A volume boot record (VBR) is the first sector of a data storage device that has not been partitioned, or the first sector of an individual partition on a data storage device that has been partitioned.
According to Microsoft, the basic data partition is the equivalent to master boot record (MBR) partition types 0x06 , 0x07 (NTFS or exFAT), and 0x0B . [2] In practice, it is equivalent to 0x01 , 0x04 , 0x0C (FAT32 with logical block addressing), and 0x0E (FAT16 with logical block addressing) types as well.