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I'm trying to turn on BitLocker on a 1TB drive in an MSI GS70 laptop running Windows 8 Pro.

As soon as I click "Turn On BitLocker", the first step of the wizard shows the following error:

The request could not be performed because of an I/O device error.

I've already gone through the steps of allowing BitLocker without a TPM, and attempting to enable it on other devices (an external USB drive in this case) works fine.

No events appear in Event Viewer while doing this, and the drive is otherwise running fine.

What other things could I look for in trying to get BitLocker working, or is there any way to get a more detailed error message?

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