What Requirement Must A Computer Meet In Order To Support Booting From A GPT Partitioned Disk?


Computers form the backbone of all systems, projects, businesses, enterprises, researches, setups, etc. They have wholly captured the space of calculations and logical operations for inferences and manipulation. The backbone of the computer system in itself is its Operating System. It turns on and performs various functions due to the smooth booting and operating ability of this system in the background. When you switch ‘ON’ your computer it takes a certain amount of time (generally few seconds), to load this operating system in its workable mode. It is very necessary for the smooth and proper functioning of the computer as a whole.


GPT stands for GUID Partition table. It is a kind of standard layout on the computers physical storage that enables smooth booting of the operating system. It is stored on the hardware drive or the solid state drive. GPT forms the new standard of booting which is now preferred as it is smoother and faster in functionality.

Earlier PC’s were empowered with a PC BIOS System(Binary input output system) which had Master Boot Record (MBR) partition tables for booting the device. The major limitation of the Master Boot Record tables is that they use 32 bits for logical block addresses and their size information was stored on 512 byte disc sector. This is basically the division of the disc space that defines where the information is kept and stored. Since, the amount of storage utilized in this kind of addressing was less, it required more time from the processor to allocate files and use them for functionalities. Due to these shortcomings the newer versions of PC’s or computer operating system support GTP.

Moreover the BIOS system limited partitions to a disc space of 2 TB, which in today’s world seems as a small number. BIOS was replaced by UEFI(Unified Extensible Firmware Interface), a specification that defines the new interaction process between an operating system and other hardware and software of the computer. The unified EFI Forum defines this standard officially. This replacing of BIOS standards by the UEFI specifications makes computers operating systems faster with smoother start up, sleep resume and shut down processes.

GPT or the GUID partition cables are a subset of the newer UEFI specifications. Instead of the older 32 bits system, it allocates 64 bits for logical block addresses. It thus, allows addressing of 2^64 sectors of a disc space leading to 9.4 ZB of disc space. The major issue between the two systems arise when some of the older BIOS based computers are not able to support booting from GPT Partitions. At this time these steps can be followed to sort the issue:

  • Ensure that while installing Windows on your UEFI PC’s, their partition style also supports UEFI mode or legacy BIOS compatibility mode. In order to sort this issue reboot your PC in the BIOS compatibility mode. For this, Boot the PC and use the manufacturer’s key to open the menu. It may be F1, F2, F10, F11 or F12 and select the desired mode.
  • If the Windows is already installed, but is not able to boot click on the power button. Now, press ‘shift’ key and select ‘restart’. Now select ‘troubleshoot’, and in ‘advance option’ select ‘UEFI Firmware Settings’. Go to the Boot device menu and select ‘UEFI’ or ‘compatible BIOS’ on both Firmware and device modes.
  • Once done ensure to configure your device for GPT partition style under the UEFI features.
  • If unresolved, you can covert the drive into UEFI mode using Windows setup. For this, turn off your computer and insert the Windows installation DVD or USB. Now boot it in the UEFOI mode or Legacy BIOS mode. When asked for the installation type, choose ‘Custom’. When asked as to ‘Where do you want to install Windows’ , Select the two allocated partitions and delete them. Select the single area of unallocated space and click ‘NEXT’. Now follow the steps ahead. Windows shall boot in the UEFI mode with the reformatted GPT drive partition tables in place. Hopefully it shall resolve your issue.
  • If still unresolved you would have to manually delete the drive and convert it to GPT. For this switch of your computer and insert Windows installation DVD or USB key. Boot the PC in UEFI mode. Open Windows setup and press ‘SHIFT’ key with the F10 key. It shall open up the command prompt. Now type ‘DISK PART’. Give in the command ‘List Disk’. It shall enumerate the various drives. Now select the requisite drive for reformatting. Type ‘Select Disk<Disk Number>’ then type ‘Clean’, ‘Covert GPT’, ‘Exit’. Close the command prompt. As earlier, choose the installation type as ‘Custom’, and select the unallocated space and click next. Follow the module for the installation. This shall solve your PC issues of rebooting through the GPT partition style.
  • As GPT supports higher security during boot time, Windows 10 provides special tool to convert a disk from MBR to GPT. For this first of all take full back up of your computer. Check your SYSTEM32file for GPT partitioning through the MBR2GPT.exe file. If unavailable, restart your computer and click on ‘Troubleshoot’ and select on ‘ADVANCED’ options. Open the command prompt for rebooting. Click on your account and log in. Now, type ‘mbr2gpt/validate’ and press ‘ENTER’. Now type in the ‘mbr2gpt/convert’ and press ‘ENTER’. It is advisable to use this process only when the desktop is not fully loaded.

It shall convert your computer booting system to the UEFI specifications with the GPT partition. In case if you still face a problem, call our talented pool of experts who are available 24/7 to keep you worry-free regarding the use of these products.

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