Eastern is sharing technical stuff about IT
Check whether disk is GPT or not in Windows

When your computer is having a UEFI , it will prefer a GPT (GUID Partition Table) on the harddisk to function. GPT has advantages over MBR (Master Boot Record) such as support for larger disks.

Start the diskpart.exe and run the command:

list disk

When there is a star in the Gpt column the disk is Gpt, else it is an MBR disk.

(Example of a disk without GPT)

More information about the difference between GPT and MBR can be found on the Wiki pages:

GPT = GUID Partition Table (
MBR = Master Boot Record (

VMware Workstation  and UEFI

Virtual UEFI firmware can be enabled on VMware Workstation 8.x or 9.x, but it is not officially supported.

To do so add the following line to your .vmx file of the virtual machine.

firmware = "efi"

Next time you start the Virtual Machine you will see this screen:

Instead of the BIOS screen of VMware. Starting installing Windows 8 in UEFI mode is now possible. Unfortunately it is not possible to enable Secure Boot in VMware yet.

Changing from BIOS to UEFI also changes the hardware of the Virtual Machine. Normally a VM identifies it as VMware Virtual Platform, with UEFI this is changed to ‘VMware 7.1’ (in my case). So be care full with this.