NTLDR missing on a drive I don't want booting

[AWS]

Hello all,

 

I have some USB drives that I can boot the computer with them plugged in. No problem. But there is one in particular (NFTS, 1TB) that if its plugged the computer tries to boot from and I get NTLDR missing error. I don't want windows to try and boot

from this drive

 

I never made this drive bootable at least not intentionally. I looked for system files in the root of the drive and found none. Comparing partition information (windows disk management) with other drives the only difference is this particular drive is

Healthy (Active, Primary) while others are all just Healthy (Primary).

 

Is the "Active" guilty? If so how can I make it not Active?

 

Thanks

 

 

 

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