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I just got a new laptop without any OS (it had FreeDOS, but not anymore). When I go to Windows Installer and try to create a new partition from un-allocated space, I don't get any Error message but the installer is unable to create the partition. At the bottom of the installer window, there's a warning which says something like,

Windows cannot install on MBR *partition. On EFI systems, Windows can only install on GPT *partition

How can I convert MBR to GPT *partition without any OS?

*I am not sure if it was partition or not

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I would find a bootable Linux disk that will allow you to format the hdd as a GPT partition. Here is one such tutoral and tool and – Ramhound Jun 26 '13 at 17:13

2 Answers 2

up vote 3 down vote accepted

You should be able to do this with a live distro of GParted I believe.

This is a fairly generic tool which allows a number of operations to be performed on drives whilst booted up from a USB stick or CD-ROM

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This is easy, when you go through instalation guide, you can at any time press Shift + F10 - command line shows up. Then write "Diskpart", then "List Disk". You see there a list of your disks, then select the one you wanna convert - "Select disk 0" (just for an exam), clean it with "Clean", and convert into GTP "Convert GTP". Enjoy

Unluckily I wanna MBR and got GTP :/

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