GPT Partition Style Fix to Successfully Install Windows

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GPT Partition Style Fix to Successfully Install Windows

Solutions to - windows cannot be installed on this disk. The selected disk is of the GPT partition style.

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  • Domain - www.aomeitech.com

  • Category - Computer Basics/Computer Basics

  • Submitted By - Helen Green

  • Submitted on - 2018-01-29 14:07:24

Description

General Information about GPT, MBR, UEFI and BIOS
GPT – GUID Partition Table
It is a standard for the layout of the partition table on a physical hard disk, using globally unique identifiers (GUID).

MBR – Master Boot Record
It is a special type of boot sector at the very beginning of partitioned computer mass storage devices like fixed disks or removable drives intended for use with IBM PC-compatible systems and beyond.

GPT vs MBR
Both GPT and MBR are hard disk styles. Generally, GPT is advanced than MBR in disk size and partition number. MBR disk type supports up to 2 TB disk space and 4 primary partitions, while GPT supports up to 9.44 ZB disk space and unlimited partitions.

UEFI – Unified Extensible Firmware
It is a specification that defines a software interface between an operating system and platform firmware.

BIOS – Basic Input/Output System
In IBM PC compatible computers, it is also known as System BIOS, ROM BIOS or PC BIOS, is a de facto standard defining a firmware interface.

UEFI vs BIOS
UEFI enables better usage of larger hard disks and can boot from disks larger than 2 TB.

UEFI is faster than BIOS by various tweaks and optimizations.

UEFI has room for more useful and usable features than could ever be crammed into the BIOS.

A powerful pre-boot environment capable of running applications.

Modular design.

CPU-independent architecture (Itanium, x86, x86-64, ARM Arch32, Arm Arch64).

BIOS interface compatibility and legacy booting.

“UEFI + GPT” & “BIOS (legacy) + MBR”
“UEFI + GPT” and “BIOS (legacy) + MBR” are usual matches. Theoretically, “UEFI + MBR” is also possible yet hardly people do so.

Solutions to “The selected disk is of the GPT partition style" Error
Some people may encounter problem like "Windows cannot be installed on this disk. The selected disk is of the GPT partition style" while install Windows operating system on GPT disk.

The Selected Disk is of the GPT Partition Style

This is due to the hard disk is not compatible with the boot mode. To solve this error, first of all, check what boot mode you are using, UEFI or legacy BIOS? If the boot mode you are using is not UEFI, enter BIOS to change it from legacy to UEFI. Then, try to install again.

If your computer’s motherboard itself does not support UEFI, you have no “UEFI” option in BIOS to choose. Or, if the system you are going to install is a 32-bit one, you still can’t get it installed on GPT partition for only 64 bit OS supports boot from GPT drive. No matter which situation you are in, you then have to convert GPT to MBR disk before system installation.

Tip: If it is due to the system you are going to install is a 32-bit one, then, you’d better boot up from legacy mode to convert target disk from GPT to MBR.

Before start, backup important files.

Solution One – Convert GPT to MBR Using Diskpart
1. Boot up computer from installation CD/DVD.
2. Click “Install Now” but DO NOT follow through.
3. Press “Shift + F10” to launch console.
4. Type "diskpart" to enter Diskpart. Then, type “list disk” -> “select disk #” (# is the number of the disk you want to convert) -> “convert mbr” -> “exit”.
5. Continue to install operating system.

Solution Two – Convert GPT to MBR by Windows Setup
1. Boot from installation DVD.

2. Select “Install Now”.

3. On setup interface choose “Custom (Advanced)”.

4. Click “Drive Options”.

5. Choose partition(s) you want to format.

6. Click “Format - this will delete everything on that partition”.

7. Create a new partition and pick a partition to install OS. Windows will automatically detect the legacy boot mode and create MBR partition table.

8. Continue to install OS.

Solution Three – Convert GPT to MBR with AOMEI Partition Assistant
AOMEI Partition Assistant is a reliable disk manager, to make use of it, you should first download and install it. If this is fresh Windows installation or reinstallation with the current system not available, then you need to install Partition Assistant on another healthy computer and create a bootable USB first with it. Then, install Partition Assistant on another USB. Next, connect the two USBs to the target computer, boot from the bootable USB and launch Partition Assistant from the other USB.

If the current system is still available, just install Partition Assistant on the target computer but not on the target disk. If there is no other disks on the target computer, you can insert an USB to install Partition Assistant. Just keep the USB connected to the machine while GPT to MBR conversion.

1. Right click the target disk and choose “Convert to MBR Disk”.

Convert to MBR Disk

2. Confirm by click “OK”.

Confirm Convert to MBR

3. Preview the result and click “Apply” to carry out the conversion.

Convert o MBR Disk Apply

Solutions to "The selected disk has an MBR partition table” Problem
On the contrary, sometimes, users may get these error messages while installing systems: "The selected disk has an MBR partition table. On EFI systems, Windows can only be installed to GPT disks" or “Windows cannot be installed to this disk. The selected disk is not of the GPT partition style”.

The Selected Disk Has an MBR

This is also due to compatibility problem between boot mode and partition table style. In this situation, you should either alter boot mode from UEFI to legacy BIOS-compatibility mode or convert MBR disk into GPT.

If you choose to convert disk type from MBR to GPT, there are several ways.

Solution One – Convert MBR to GPT Using Windows Setup
1. Boot up the computer with installing CD/DVD in UEFI mode.

2. Select “Custom” when choose an installation type.

3. On the “Where do you want to install Windows?” screen, select each of the partitions on the drive, and select “Delete”. Then, it will show an unallocated space.

4. Select the unallocated space as system installation destination and click “Next”. Windows will detect that the PC is booted into UEFI mode, and reformat the disk with GPT partition style. Then, it will continue the installation.

Solution Two – Convert MBR to GPT with Diskpart
1. Boot up computer from installation CD/DVD.
2. Click “Install Now” but DO NOT follow through.
3. Press “Shift + F10” to launch console.
4. Type "diskpart" to enter Diskpart. Then, type “list disk” -> “select disk #” (# is the number of the disk you want to convert) -> “convert GPT” -> “exit”.
5. Continue to install operating system.

Solution Three – Convert MBR to GPT by AOMEI Partition Assistant
Like described above, prepare Partition Assistant for use. Also, the steps for converting MBR to GPT just like convert GPT to MBR. Just note that make a backup of important data of the target disk before conversion.

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