Searching for Windows GUID Or MBR Partition Recovery

To recover Windows GUID or MBR Partitions, first, we need to know, what is GUID and MBR Partition Tables.

GUID stands for Globally Unique Identifiers and is a standard for the layout of the partition table on a physical hard disk. Because of the limitations of Master Boot Record (MBR) partition tables, GUID used on some BIOS systems and they use 32 bits for storing Logical Block Addresses (LBA) and size information. 

Also, Read - How to Recover Data from Crashed Hard Disk



Before using a disk drive user have to partition a disk. Master Boot Record (MBR) and GUID Partition Table (GPT) are two ways of storing the partition information on a drive. The reason behind choosing MBR or GPT before creating partitions on a drive is that this information includes where the partition starts and activates. In this case, your operating system knows which sector belongs to each partition and which partition is bootable.



Limitations in using MBR Partition.

Master Boot Record (MBR) was introduced with IBM PC DOS 2.0 in 1983. MBR has a special boot sector located at the beginning of a drive that’s why it is called Master Boot Record. For the installed operating system and information about the drive’s logical partitions, the sector contains a boot loader. It is a small bit of code that usually loads the longer boot loader from another partition on a drive. If someone has Windows installed, the initial bits of the Windows Boot Loader reside here. Due to this user have to repair MBR if it’s overwritten and Windows won’t boot. The GRUB Boot Loader will be located in the MBR if you have Linux installed. But MBR is lacking in size. It works with a disk up to 2 TB in size, it cannot handle more than 2 TB disk space. It has only four primary partitions and if the user wants more then make one of your partition an extended partition and create logical partitions inside it. 



 Advantages of using GUID Partition Table.

GUID Partition Table is a new technology which slowly but surely replacing MBR because it is associated with the UEFI and UEFI replaces the clunky old BIOS with modern technology. The name “GUID Partition Table” comes out because every partition on the drive has a “globally unique identifier”. So if users use GIP then their system doesn’t have MBR’s limitations like size limits will depend on the operating system and its file systems, the disk can be much, much larger. GUID Partition Table offers an almost unlimited amount of partitions but the limit here will be the operating system. Windows offers up to 128 partitions on a GPT drive without any creation of extended partition.    

On the other hand, the partitioning and boot data are stored in one place on an MBR disk. If this data got corrupted or overwritten then your data permanently gone. But GPT stores multiple copies of the data across the disk. If in case your data got corrupted or overwritten, you can recover it easily. GPT also has CRC (cyclic redundancy check) values to check that data is intact. GPT has the capability to recover the damaged data from another location on the disk by detecting the problem itself. But MBR has no way of detecting the problem if the data got corrupted.



Know where you can use GUID Partition Table

GUID Partition Table (GPT) includes a “protective MBR” and this type of MBR states that the GUID Partition Table has a single partition that extends across the entire drive. GUID Partition Table will see a single partition that extends across the entire drive, if the user tries to manage a GPT disk with a tool that can only read MBRs and the MBR will make sure that the tools won’t mistake the GPT drive for an un-partitioned disk and overwritten the GPT data with a new MBR. That means the protective MBR protects the GPT data from being overwritten.

GPT is compatible with Windows 10, 8.1, 8, 7, Vista, and other server versions and Windows can only boot from GPT on UEFI-based computers running the 64-bit version. Other modern operating systems can also use GUID Partition Table. Linux has built-in support for GPT. Moreover, Apple’s Intel Macs no longer use Apple Partition Table (APT) scheme and use GPT instead. 


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