MBR stands for Master Boot Record. It is a legacy partitioning scheme used on a hard disk drive that defines the layout of the partition table and the structure of the disk. MBR has been in use since the early days of the PC, and it is still supported by most modern operating systems.
The MBR partitioning scheme is limited to a maximum of four primary partitions or three primary partitions and one extended partition. This can be a problem for users who need to create more partitions, as it requires the use of logical partitions within an extended partition. MBR is also limited to disks with a capacity of up to 2 terabytes.
The MBR partitioning scheme is stored in the first sector (sector 0) of the hard disk, which is also known as the Master Boot Record. The MBR contains the boot loader code that is executed when the computer starts up, as well as the partition table that defines the layout of the disk.
While MBR has been widely used for many years, it has some limitations that have led to the development of newer partitioning schemes, such as GPT (GUID Partition Table). GPT provides support for larger disk sizes, a more flexible partitioning scheme, and better data redundancy and recovery options. However, MBR is still supported by many operating systems and is still in use on many older computers.