ASRock Forums : UEFI, GPT? https://forum.asrock.com/ Copyright (c) 2006-2013 Web Wiz Forums - All Rights Reserved. Sat, 11 Apr 2026 11:27:43 +0000 Sat, 10 Nov 2018 23:20:17 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.04 360 https://forum.asrock.com/RSS_post_feed.asp?TID=10116 <![CDATA[ASRock Forums]]> https://forum.asrock.com/forum_images/web_wiz_forums_black.png https://forum.asrock.com/ <![CDATA[UEFI, GPT? : I just wanted to avoid the pain...]]> https://forum.asrock.com/forum_posts.asp?TID=10116&PID=57731&title=uefi-gpt#57731 Author: TomBm
Subject: 10116
Posted: 10 Nov 2018 at 11:20pm

I just wanted to avoid the pain of reinstalling everything, altough I think it would have been easier than trying to clone old disk number of times before finally getting it right. So I managed to transfer OS from old MBR disk to new GPT drive successfully and even got it to boot. Apparently it was necessary to

1) create 250MB EFI-partition to new GPT drive first before anything using diskpart
2) then clone old partitions after that
3) and finally boot into command prompt using Win10 recovery USB thumb drive and add+fix bootloader on new GPT disk.

There was also CSM-setting in BIOS that I disabled but I don't know if it was necessary. Apparently it enables support for old MBR stuff so I don't need it anyway anymore.
]]> Sat, 10 Nov 2018 23:20:17 +0000 https://forum.asrock.com/forum_posts.asp?TID=10116&PID=57731&title=uefi-gpt#57731 <![CDATA[UEFI, GPT? : What happens with a fresh install?...]]> https://forum.asrock.com/forum_posts.asp?TID=10116&PID=57728&title=uefi-gpt#57728 Author: RLGL
Subject: 10116
Posted: 10 Nov 2018 at 10:22pm

What happens with a fresh install?]]> Sat, 10 Nov 2018 22:22:05 +0000 https://forum.asrock.com/forum_posts.asp?TID=10116&PID=57728&title=uefi-gpt#57728 <![CDATA[UEFI, GPT? : I was planning to upgrade from...]]> https://forum.asrock.com/forum_posts.asp?TID=10116&PID=57710&title=uefi-gpt#57710 Author: TomBm
Subject: 10116
Posted: 10 Nov 2018 at 2:09am

I was planning to upgrade from 500GB hard drive to 3TB hard drive. I tried to clone Win10 installation and partitions from old drive to new one but it resulted in unbootable drive because new drive was formatted as GPT drive. Another method cloned drive using MBR only but about 700GB remains unallocated and can't be used due to 2TB limitation of MBR.

To my understanding some kind of UEFI setting should be enabled to allow booting from GPT drive but I can't find such setting in my UEFI BIOS of Asrock P67 Pro mainboard. Also Win10 system information shows BIOS as "legacy". Doesn't my MB support UEFI even if it does have UEFI BIOS or should it detect GPT drives automatically? Or is fresh installation of Win10 on new drive the only way?


Edited by TomBm - 10 Nov 2018 at 2:10am]]> Sat, 10 Nov 2018 02:09:10 +0000 https://forum.asrock.com/forum_posts.asp?TID=10116&PID=57710&title=uefi-gpt#57710