It also provides proper PC functionality and security protocol for all read/write data transactions. This identifier ensures that the correct drive and partition reads and writes data using several disks. Disk signature: Every drive needs a unique identifier, which gets created in the form of a signature.Master boot code: Sometimes abbreviated as MBC, the code executes the launch of the operating system and manages the configuration for the bootup process (to confirm any changes), such as detecting drives, calculating RAM (external), detecting displays, and other essential device and configuration information.The MPT provides all that essential information. For the OS and the PC to function correctly, they need a record of HDD partitions and sizes plus a way to identify the bootable, active partitions.

Master partition table: Abbreviated as MPT, the table stores all partition information found on each SSD/HDD, including their format type, capacity, and other necessary details.

The MBR data stored in LBA 1 of the HDD includes the following:

Upgrade macbook pro hard drive ssd