Microsoft says it may give your encryption key to law enforcement upon a valid request. Here's how to protect your privacy.

Open the Control Panel, and click the BitLocker Drive Encryption icon. To Turn On Auto-unlock: Click on the chevron to collapse the fixed data drive or removable data drive that you want to turn on ...

I'm not sure if anyone saw the news, but apparently Crucial's and Samsung's self-encrypting drives have very weak keys or key verification and is easily bypassed to get access to the encrypted data.

Microsoft stores the hard drive encryption key in customers' online accounts by default. It can be accessed there with a court order.