What is GPT ? - Unable to install windows in GPT drives error -

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What and Why GPT ?

GPT was initiated as a part of UEFI ; which the latest system posses.It was implemented as to avoid the MBR-Master Boot Record which nowadays system uses.
You can see whether your system supports UEFI in the BIOS settings - Boot options.
Mainly there will be two options like Legacy and UEFI.Suppose if you want to boot some USB /DVD drive then you have to select Legacy option.

 How to resolve the error " Unable to install windows 7 / 8 in GPT Drive " ?

Put a Windows XP CD /DVD and boot up to the Formatting part .Then delete all the partitions and make a new one and using the format NTFS.Please don't proceed further after the formatting to the installation.
Now restart and install Win 7 or 8.
Why GPT?

It provide more flexibility in the partitioning of the drives.Before the GPT we used the MBR - Master boot record, which has many limitation in the drive partitioning.

 In GPT we use GUID - Globally Unique Identifier which evolves as a part of distributed computing.

 Whats wrong with MBR?

 The MBR can only have up to 4 partitions and it pulls up some new problems between logical and primary drives.

 "GPT disks can grow to a very large size. The number of partitions on a GPT disk is not constrained by temporary schemes such as container partitions as defined by the MBR Extended Boot Record (EBR) 
The GPT disk partition format is well defined and fully self-identifying. Data critical to platform operation is located in partitions and not in unpartitioned or "hidden" sectors. GPT disks use primary and backup partition tables for redundancy and CRC32 fields for improved partition data structure integrity. The GPT partition format uses version number and size fields for future expansion."- as Microsoft says .

"MBR-based partition table schemes insert the partitioning information for (usually) four "primary" partitions in the master boot record (MBR) (which on a BIOS system is also the container for code that begins the process of booting the system). In a GPT, the first sector of the disk is reserved for a "protective MBR" such that booting a BIOS-based computer from a GPT disk is supported, but the boot loader and O/S must both be GPT aware. Regardless of the sector size, the GPT header begins on the second logical block of the device."-as Wiki says



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