📎 AI Summary:
The thread discusses converting an MBR disk to GPT without data loss, primarily using third-party tools like AOMEI Partition Assistant and EaseUS Partition Master Pro. The original poster has experienced difficulties with the process and seeks guidance from others, particularly on the correct steps to ensure successful conversion. Contributors suggest that the process can be straightforward with the right approach but emphasize backing up data and following precise steps, with some users offering detailed instructions and reassurance.
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NettleWarbler

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Thread Author #1
Convert MBR to GPT without Data Loss ,using AOMEI Partition Assistant . Is it that easy ? . Has anyone used AOMEI Partition Assistant , is it instant do you have to restart .
 

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NettleWarbler

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Thread Author #63
I tried Uefi custom install , tried to delete the partitions 2 were greyed out i could'nt delete them . Now all i'm getting on my main hard drive is reboot and select proper boot device , that must be with deleting the partitions . The sizes shown that i could'nt remove were 2048GB and 14716GB .
 

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kemical

kemical

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#65
Did you change your boot order so that you booted from the media windows is on?
 

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kemical

kemical

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#67
NettleWarbler said:
I selected Uefi mode and tried to delete the partitians 2 were left
Click to expand...
Hmm that's not what I'm asking, did you boot from the media windows is on?

It doesn't sound like you did otherwise you would be able to delete those partitions.
 

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NettleWarbler

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Thread Author #68
There were 2 modes legacy and uefi i selected uefi ( clicked on it so that was the only option ) then tried to delete the patitions .
 

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kemical

kemical

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#69
NettleWarbler said:
There were 2 modes legacy and uefi i selected uefi ( clicked on it so that was the only option ) then tried to delete the patitions .
Click to expand...
I assume you mean in the bios?

You then need to boot from the media windows is on.

Start the install process and find the drive you want as your boot drive.

You then delete all partitions and click next.

Windows will install to gpt partition.
 

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NettleWarbler

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Thread Author #70
When i tried to install windows there were 2 partitians left i could'nt delete ( greyed out ) , which meant i could'nt install .
 

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kemical

kemical

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#72
NettleWarbler said:
When i tried to install windows there were 2 partitians left i could'nt delete ( greyed out ) , which meant i could'nt install .
Click to expand...
Can you describe what you actually did to get to the above point please.

I keep asking if you booted from the media windows is on and I wonder why you keep ignoring my request.

As you asked above on how to boot from install media I now doubt this is what your actually doing.

If your simply rebooting the machine with the install media inserted then that won't do it, you have to tell the system (bios) to boot from either the disk or usb windows is on. This is so you can have full access to your boot drive otherwise you can't delete partitions ect..

This is usually a relatively simple process.
 

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bochane

bochane

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#73
kemical said:
I keep asking if you booted from the media windows is on and I wonder why you keep ignoring my rerequest...
Click to expand...
Seriously, someone helping you , next to you, at your side, with direct one to one contact , won't be a bad idea.
 

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NettleWarbler

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Thread Author #75
When i clicked disk management , right clicked the disk and selected convert to gpt it did . I converted it before but failed to initialise it . Theres still windows to load .
 

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NettleWarbler

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Thread Author #77
I was wondering if disk management could remove the patitions , so the arn't greyed out when i try to install windows in uefi mode .
 

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kemical

kemical

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#80
I watched your video and i use exactly the same process except I do not use the commands shown. I simply delete the partitions and click next.

I have a feeling part of your issue is the size of the drive. Over 2.2TB the drive needs to initialized to GPT first before it can used as a boot drive. Thats why in your screengrab you see a partition of 2TB and then the unallocated section because mbr can only handle 2,2TB.

Do you have a different, smaller, drive you can pop windows on and then format the big drive to gpt?

Further reading:
Windows support for hard disks exceeding 2 TB - Windows Server
 

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