📎 AI Summary:
The thread discusses a user’s issue with multiple bootable drives, where after adding a third drive, only the new drive remains bootable. The responders suggest checking whether the drives are GPT or MBR, as MBR requires a boot flag to be set for bootability, and recommend using tools like Gparted to modify drive flags. The overall sentiment is troubleshooting how to restore boot capability to the original drives, with helpful advice on partition setup and tools.
Computerman

Computerman

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Thread Author #1
I have a desktop with 3 hard drives which were all bootable. I added a third drive and now the new drive seems to be the only one that I can boot to. In disk management only the new drive shows boot. The other 2 drives are active and primary. Does anyone know how I can make these drives bootable again
 

Neemobeer

Neemobeer

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#2
Is there an actual operating system and system partition on each drive? Also are these drives using MBR or GPT?
 

Computerman

Computerman

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Thread Author #3
Yes these drives have an operating system, they were booting fine and now they don't have the boot option
 

Neemobeer

Neemobeer

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#4
Are they GPT disks?
 

Computerman

Computerman

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Thread Author #5
Whatever way windows would default format these disks, they were working fine yesterday
 

Neemobeer

Neemobeer

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#6
If they're GPT they don't need the boot flag if they are MBR you would need to add the boot flag back into the MBR. Other than the Windows installer process, Windows doesn't have a built-in method for re-adding this.
 

Computerman

Computerman

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Thread Author #7
Neemobeer said:
If they're GPT they don't need the boot flag if they are MBR you would need to add the boot flag back into the MBR. Other than the Windows installer process, Windows doesn't have a built-in method for re-adding this.
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Is there a way to do this and have my programs still work correctly?
 

Neemobeer

Neemobeer

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#8
There are numerous tools to set it, Gparted in a live linux, such as Ubuntu, can set the flag pretty easily. Whether or not the other drives will but is questionable from setting the boot flag.
 

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