Sunday, June 1, 2014

MBR vs GPT-Comparison of Disk Partioning schemes

When you are going to install windows operating system,Disk Partitioning is a prior step .There some times you may mess with 2 words GPT and MBR.today I will teach you what it means.
Microsoft offers 2 types of architectures for disk partitioning.
MBR(Master Boot Record)
The original method of partitioning disks is referred to as MBR (Master Boot Record) which was developed during the 1980’s.MBR disks only have 1 partition table to keep track of all the blocks in the partition. If the table becomes corrupt, the entire disk must be recovered from backup. Windows GPT-based disks have multiple, redundant partition tables so that if one is detected as being corrupt, it can self-heal itself from a redundant copy of the table. It is possible to convert an MBR disk to a GPT-based disk and vice versa, but any data must first be backed up and all the partitions deleted.

GPT (GUID Partition Table)

Microsoft adopted the GPT disk partitioning scheme in 2001 from Intel’s EFI (Extensible Firmware Interface) specifications. It accommodates disk partition sizes up to 18 EB (Exabyte’s) or 1 million terabytes.Another shortcoming of MBR-based disk partitions is the limitation of 3 primary partitions and 1 extended partition. The extended partition can be further divided into multiple logical partitions. By limiting the number of partitions on a disk, you effectively reduce the number of partitions to organize or manage the data. With GPT-based disks, Microsoft supports up to 128 partitions per disk. There are several partitions reserved for dynamic disks and EFI-boot support so only 124 partitions are available for data.
 
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