It is normal, I'm pretty sure the HB just creates a "key pair" for using the user lake mapping feature, I forget what it is called - because I never use it. It doesn't actually encrypt anything unless you use the feature (which requires a paid zero line card, or something). The manual or website probably has more info, or maybe someone uses this. You can just deleate the update filse from the card and use it for storing screen shots and saving user data.
"Alive without breath, as cold as death; never thirsty, ever drinking, all in mail never clinking."