GPT VS MBR

What do GPT and MBR do

You have to partition a disk drive before you can use it . MBR (master boot Record ) and GPT (GUID partition table ) are two different ways of storing the partitioning information on a drive .this information includes where partitions start and begin so your operating system know hich sectors belong to each partition and which partition is bootable .this is why you have to choose MBR or GPT before creating partitions on a drive

MBR

MBR standards for Master Boot Record. It was introduced with IBM PC dos in 1983

it's called Master Boot Record because the MBR is a special boot sector located at the beginning of a drive. this sector contains a boot loader for the installed operating system and information about the drive's logical partition .the boot loader is small but of code that generally loads the larger boot loader from another partition on a drive. if you have windows installed the initial bits of the windows boot loader reside here ---- that's why you may have to repair your MBR it is a overwritten and Windows won't boot it you have Linux installed , the GRUB boot loader will typically be located in the MBR.

MBR Limitation

* MBR works with disks up to 2 TB in size, but it can't handle disks with more than 2TB of space. MBR also only supports up to four primary partitions -- if you want more you have to make one your primary partitions an "extended partition “and create logical partitions inside it this is a silly little hack and shouldn't be necessary.

*MBR became the industry standard everyone used for partitioning and booting form disks. Developers have been piling on hacks like extended partitions ever since

GPT

GPT stands for GUID Partition table .it's a new standard that’s gradually replacing MBR. it's associated with UEFI --- UEFI replaces the clunky old BIOS with something more modern , and GPT replaces the clunky old MBR partitioning system with something  more modern .it's called GUID partition table because every partition on your drive has a "globally unique identifier" or GUID - a random string so long that every GPT partition on earth likely has own unique identifier.

GPT Limitation

This system doesn't have MBR's limits .Driver can be much ,much larger and size limits will depend on the operating system and its file systems GPT allows for a nearly unlimited amount of partition, and the limit here will be your operating system -- windows allows up to 128 partition on GPT drive , and you don't have to create an extended partition

* On an MBR disk the partitioning and boot is stored in one place .if this data is overwritten or corrupted , you trouble . in contrast GPT stores multiple copies of this data access the disk.so it much more robust and can recover if the data is corrupted .GPT also stores cyclic redundancy check (CRC )values to check that its data is intact -- if the data is corrupted GPT can notice the problem and attempt to recover the damaged data form another location on the disk .MBR had no way of knowing it its data was corrupted --- you'd only see there was a problem when the boot process failed or your drive's partition vanished.,