Windows 10 Make an active partition able to boot

Computerman · Apr 12, 2017

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 · Apr 13, 2017

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

Computerman · Apr 13, 2017

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

Neemobeer · Apr 13, 2017

Are they GPT disks?

Computerman · Apr 13, 2017

Whatever way windows would default format these disks, they were working fine yesterday

Neemobeer · Apr 13, 2017

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 · Apr 13, 2017

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.

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

Neemobeer · Apr 13, 2017

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.

Windows 10 Make an active partition able to boot

Computerman

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Neemobeer

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Computerman

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Neemobeer

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Computerman

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Neemobeer

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Computerman

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Neemobeer

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