Make an active partition able to boot

Computerman

Member
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

Cloud Security Engineer
Staff member
Is there an actual operating system and system partition on each drive? Also are these drives using MBR or GPT?
 

Neemobeer

Cloud Security Engineer
Staff member
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

Member
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.

Is there a way to do this and have my programs still work correctly?
 

Neemobeer

Cloud Security Engineer
Staff member
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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