Is it possible to add a separate new MBR HDD 2TB to old GPT HDD 4TB ?

Nov 9, 2018
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Hi, I have 4TB HDD (MBR) converted to GPT few years back (as I have an old motherboard with UEFI support). I used AOMEI partition to convert it from MBR to GPT for complete 4tb usage.

Now my windows has corrupt & wouldnt let me format or reinstall due to GPT partition style.

I bought a separate 2TB HDD (default MBR) & want to install windows on it.

So my question, is it possible to do this ? If yes, any steps to be taken care of ?

Motherboard - Gigabyte Z68X-UD7-B3

HDD - WD BLACK 4TB & 2 TB
 
HDDs generally do not come with any partition table. Simply install windows on it as normal and it will write whatever partition table is necessary.

If you've already formatted the drive, many freeware tools will allow you to change the partition table (this generally requires wiping the drive), and the Windows installer will do it for you if you delete all partitions on the drive and make one new one to install the OS on.
 

The Paladin

Glorious
Herald
yes you can have one drives formatted in GPT and one drive as MBR side by side each formatting of drives are handled differently in the operating system and will not cause an data issue.

you said
Now my windows has corrupt & wouldnt let me format or reinstall due to GPT partition style.
which leads me to a question; how did you installed windows on GPT partition previously ?
 

Colif

Titan
Moderator
which version of Windows?

Did you try deleting all the partitions on the 4tb drive? Often the GPT error just wants you to delete all the partitions so windows can make its own (at least, thats what happens with win 10)

If you installing win 10, and you have UEFI support, win 10 will want you to use GPT as well. It will throw an error about GPT at you in the install process, and answer is the same as above, delete all the partitions and click next.
 
Nov 9, 2018
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Hi Senior Moderator & Colif

I actually want to avoid deleting all the partitions with data on my 4TB GPT drive & keep them as it is. I just want to add an extra 2TB & install fresh copy of windows on it. Since I havent tried this before, I am confused will it work together safely.

Currently I am using Windows-7 64bit. As my system is old, it supports GPT (only after conversion). By default it picks up the MBR. Today in newer systems it automatically decides.
 
Nov 9, 2018
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Hi The Paladin,

I actually Installed Windows-7 64bit first on my empty 4TB HDD. When I saw it was only showing 2TB, I converted to GPT & unlocked the remaining 2 TB by using AOMEI partition.
 
Nov 9, 2018
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Hi SkynetRising,

Thanks for the solution. Yes that is what I had in my mind, but was afraid since I never tried. You are right about the Hybrid EFI, but it just doesnt let me install windows on my exisiting GPT drive. I tried re-installing/ formatting my current C drive (4TB), but it shows error that "Windows cannot be installed on a GPT drive"
 

Dragos Manea

Admirable
When inserting a boot drive (USB or DVD with windows) to boot in UEFI installation (aka gpt) it has a uefi in front of it, for example:
SeagateHDD
USBSTICK
UEFI:USBSTICK
So in order to try to install an operating system in gpt you must select the option with the uefi in front in my example UEFI:USBSTICK. The other option without uefi in front is the legacy mode (AKA MBR)

EDIT:I forgot to mention that after the install you dont select as boot device the HDD, you must select Windows Boot Manager in BIOS (it will be added after the install). The windows will not boot if you select your hdd, it will boot only using windows boot manager.
 
Nov 9, 2018
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Hi Guys, Thanks a lot everyone for the solution, I am gonna try those. I am yet to try the solution out. Most probably today, my engineer is going to visit to help me with this. I will keep you guys posted.
 
Nov 9, 2018
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However, I have one more question if you guys can guide me.

I have used AOMEI for MBR to GPT conversion, does uninstalling it will still keep the conversion ? I still have it installed at the moment.

Does the conversion is lifetime or it changes as soon as I removed the AOMEI software or any other conversion software ?

Thanks.
 
Nov 9, 2018
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@SkyNetRising Thanks a lot for the solution you gave. It worked. :D, I am just keeping the machine under observation. I know it will work fine. Thanks again everyone.
 

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