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GPT and MBR Disk Partition

2014/09/03 13:00

MBR: Master Boot Record is a special type of boot sector at the very beginning of  partitioned computer mass storage devices like fixed disks or removable drives intended for use with IBM PC-compatible systems and beyond. The organization of the partition table in the MBR limits the maximum addressable storage space of a disk to 2 TB (232 × 512 bytes). Therefore, the MBR-based partitioning scheme is in the process of being superseded by the GUID Partition Table (GPT) scheme in new computers. A GPT can coexist with an MBR in order to provide some limited form of backward compatibility for older systems.


GPT: GUID Partition Table is a standard for the layout of the partition table on a physical hard disk, using globally unique identifiers (GUID). Although it  forms a part of the Unified Extensible Firmware Interface (UEFI) standard (Unified EFI Forum proposed replacement for the PC BIOS), it is also used on some BIOS systems because of the limitations of master boot record (MBR)  partition tables, which use 32 bits for storing logical block addresses (LBA) and size information.


MBR disk partition: Support the largest volume for 2 TB (Terabytes) and each disk supports one up to four primary partitions or three primary partitions, one extended partition and unlimited logical drive. 


GPT disk partition: Support the maximum volume for 18 EB (Exabytes) and each disk partition has no upper limit, GPT disk partition is only limited by the operating system. Due to the partition table itself needs to occupy a certain space, so the space left for hard disk partition at the original plan determines the most partitions can have in disk. (From CCBoot v3.0 20140801, Server game disk support GPT disk partition.)

Details of GPT, please refer to http://en.wikipedia.org/wiki/GUID_Partition_Table.

Details of MBR, please refer to http://en.wikipedia.org/wiki/Master_boot_record.

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