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The MBR is not located in a partition; it is located at a first sector of the device (physical offset 0), preceding the first partition. (The boot sector present on a non-partitioned device or within an individual partition is called a volume boot record instead.)
The first sector of Track0 is known as the master boot record (MBR) and contains the initial code used to boot the operating system (bootstrap code). Near the end of the MBR is the Partition Table: a predefined structure containing the layout of the disk.
Adding or changing partition table between Apple Partition Map, GUID Partition Table, and master boot record (MBR) Restoring volumes from Apple Software Restore (ASR) images; Checking the S.M.A.R.T. status of a hard disk; Disk Utility functions may also be accessed from the macOS command line with the diskutil and hdiutil commands. [3]
TestDisk is able to recognize the following partition table formats: [2] Apple partition map; GUID Partition Table; Humax; PC/Intel Partition Table (master boot record) Sun Solaris slice; Xbox fixed partitioning scheme; Non-partitioned media; TestDisk can perform deeper checks to locate partitions that have been deleted from the partition table ...
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 ...
Forming a part of the Unified Extensible Firmware Interface (UEFI) standard (Unified EFI Forum-proposed replacement for the PC BIOS), it is nevertheless also used for some BIOSs, because of the limitations of master boot record (MBR) partition tables, which use 32 bits for logical block addressing (LBA) of traditional 512-byte disk sectors.
The Apple Partition Map maps out all space used (including the map) and unused (free space) on disk, unlike the minimal x86 master boot record that only accounts for used non-map partitions. This means that every block on the disk (with the exception of the first block, Block 0) belongs to a partition.
A Volume Boot Record (among other names) and an MBR (Master Boot record), are two completely different things. Put simply, the MBR is on the first sector of a hard drive preceding ANY partitions, while a Volume Boot Record (among other names) resides within the confines of a partition. --tallship 23 June 2012.