IIT proposes that consciousness is integrated information.
The key difference between a brain and the hard disk is the disk has no way of knowing what it is actually sensing. Brain can tell difference between many more sense and receive and use more forms of information. The camera is not conscious of the fact it sensing light and colour.
This article is a good introduction to the topic and the photodiode example in the paper is the simple version of your question http://www.biolbull.org/content/215/3/216.full
Why do I have a moral duty to do wrong thing? Shouldn’t I act in my own self interest to maximise the amount of money I make?