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Ondrej Sevecek's English Pages > Posts > You cannot turn on BitLocker auto-unlock feature for a data drive
November 19
You cannot turn on BitLocker auto-unlock feature for a data drive

The problem

You cannot turn on BitLocker auto-unlock feature for a BitLocker protected data drive although the drive is really BitLocker protected. You are actually able to manually unlock the protected data drive. But when you try to turn on auto-unlock, the error message displayed is:

BitLocker Drive Encryption
The operating system drive is not protected by BitLocker Drive Encryption

The resolution

The error message is somewhat misleading. Though it does not mention your data drive which you want to enable the auto-unlock for. It actually tells you that your operating system drive (different partition on a different disk probably) is not yet protected by BitLocker Drive Encryption.

You cannot turn auto-unlock feature on unless the operating system drive is also encrypted with BitLocker as well.

Comments

Re: You cannot turn on BitLocker auto-unlock feature for a data drive

Hello,
you described symptoms but you didn't described solution and root cause.
 on 18/01/2018 14:33

use your brain

"You cannot turn auto-unlock feature on unless the operating system drive is also encrypted with BitLocker as well."

Well you need to encrypt your C drive, thats the solution.
 on 13/04/2018 10:27

bitlocker

how do i turn the auto unlock on for the OS drive ?
 on 09/11/2018 10:31

Re: You cannot turn on BitLocker auto-unlock feature for a data drive

You do not actually "auto unlock" the OS drive itself. Assuming you're referring to the C: drive. If the OS drive is encrypted and you boot from it, it automatically unlocks at boot. "auto unlock" only applies to drives attached to the computer other than the OS drive.
 on 15/11/2018 10:26

Re: You cannot turn on BitLocker auto-unlock feature for a data drive

I had this problem last week. I was using an external hard drive attached via an external serial ATA, so I had to turn on the disk before booting Windows 10. I solved the problem by moving the disk to a USB connection, and turning it on after Windows fully boots. The auto-unlock option then appears normally and I turned it on. The disk is now back on the ATA connection, and it still auto-unlocks correctly.

(You might have this problem if you turn on a USB connected disk before booting. I haven't tried that.)
 on 26/11/2018 20:25

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