What is MBR and GPT partition tables of Computer BIOS and their advantages, disadvantages

Hello Guys!! Today I will tell you what is the MBR(Master Boot Record) and GPT(GUID Partition Table) partition tables of Computer BIOS, advantage and disadvantages. You may know about MBR,GPT. If you want to convert MBR to GPT, you should know this. Hope you will be benefited. So let’s start……

Those who work on computers, you must have heard of the legacy Bios and UEFI. The first is for MBR and the latter is used for GPT. MBR and GPT are two types of partition table on Windows which store the information such as the setup of Windows, the information we put on the hard disk, and how Windows will maintain these things. MBR is the oldest and GPT is new type of partition table. MBR is available in all BIOS, but your BIOS must support the UEFI Mode if you want to avail GPT. UEFI is activated in all bios of the motherboards that are available now. Basically the GPT has been created due to some limitations of the MBR. So let’s go to the main discussion ……

MBR (Master Boot Record)

Master Boot Record (MBR in brief) is the boot sector saved on a hard disk drive or any other storage device that contains the information of the required boot process. The master boot record stores your data in a partition on a hard drive but does not appear on the original partition And if you want to see it, you can see it from the disk partitions in the computer manager. So this does not mean that if you want to save MBR information on non-partitioned disks such as floppy disks, this is never possible. Because floppy disks can not be partitioned. Master Boot Record is the first sector of a disk. If we want to specify, then its position is cylinder 0, head 0, sector 1

MBR vs GPT- tech4bd.com


You may have heard many other types of Master Boot Record names like Master Boot Sector, Null Sector, Master Boot Block or Master Partition Boot Sector.

What role plays Master Boot Record (MBR) Actually? Master Boot Record has three main responsibilities: master partition table, disk signature and master boot code.

The master boot record plays a primary role when the computer first launches:

1. First, BIOS(Basic Input Output System) find out where it has the master boot record information in a hard disk or any other storage.

2. After finding the information, the MBR uses its boot code to identify the contents of the original system partition (briefly detects Windows partitions or C Drive).

3. This specific partition is used to start the operating system.

You are sure now that Master Boot Record plays an important role before starting the computer.

MBR supports up to 2 terabytes and can be divided into 4 partitions. Partitions can be arranged in two ways – primary and extended. Extended can be divided into several logical partitions. Since it does not support above 2 terabytes and can not make many partitions so the GPT partition table has been created.

GPT(GUID Partition Table)

GPT (GUID Partition Table) is a standard that stores information on physical storage devices such as a hard disk drive or solid-state drive partition through Globally Unique Identifiers (GUID). GUID is a random string that assigns a different identity to each partition of the hard disk so that it can be easily reclaimed. Where MBR could not afford this facility. It is a part of the UEFI (Unified Extensible Firmware Interface) system that is designed to replace the old BIOS. MBR related to BIOS, and GPT related to UEFI. At present, two features are active in the BIOS system. Depending on the operating system and its file system, GPT can support any size hard disk. GPT supports almost unlimited number of partitions. But on Windows-based systems, it supports up to 128 partitions and does not require an extended partition. An MBR disk, partition and boot data are stored in one place. If the data is either corrupt or overwrite, then Windows is failed to start. But GPT puts the boot data in different places on the computer so that data can be recovered from those places if windows corrupt. GPT always keeps its data under the Cyclic Redundancy Check (CRC) program. If the data is damaged, GPT determines the problem and tries to recover damaged data from the other location on the disk. But there is no way to know if the data is corrupt on the MBR system, you will only know when the boot process is damaged.

Thats all for now friends. I hope you have got a new thing. Thank You


If somethings happens, i must first tell you.

Leave a Reply

Your email address will not be published. Required fields are marked *