Windows 10 "the operating system drive is not protected by bitlocker drive encryption"

[Tmcthree]

Hi.

My pc has 8 drives attached to it.


A: sata ssd

B: usb

C: m2 nvme

E: m2 nvme

U: sata ssd

W: usb

X: sata hdd

Y: sata hdd

E, U X and Y are bitlocked.


I wanted to turn on the auto-unlock feature, which worked fine except for drive E, which give the error,


"the operating system drive is not protected by bitlocker drive encryption"


E isn't the os drive, but it is a fixed data drive, whereas the others are categorised as "removable".

I'm not sure what that means or how I ended up configured this way.

Can anyone explain this? How do I turn on auto unlock for E: do I have to encrypt C: as well?

How have I ended up with the sata drives being catagorised as removable and the nvme fixed? Is that a consequence of the connection type? Or did I stuff something up when built the machine?

Thanks in advance

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