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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

Sourabh
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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 http://rodsbooks.com./gdisk/mbr2gpt.html#MBR2GPT and http://rodsbooks.com./gdisk/index.html – Ramhound Jun 26 '13 at 17:13
  • You don't need any third-party utilities or LInux boot disks. You can do this from Windows Setup. Just follow the instructions in Anonymous hacker's post. – Xtremity May 01 '16 at 19:49

2 Answers2

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This is easy, when you go through installation guide, you can at any time press Shift+F10 - the command prompt will show up.

Then write Diskpart, then List Disk. You see there a list of your disks, then select the one you want to convert.

Select disk 0 (if you want to install on the first disk, for an example). Clean it with Clean, and convert into GPT Convert GPT. Enjoy

Unluckily I wanna MBR and got GPT :/

phuclv
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Anonymous hacker
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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

James
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