 Logics of information distinguish regularly between hard information and soft information. The terminology is a slight misnomer, as this distinction is not one between different types of information per se. Rather it is one between different types of information storage. Hard information is factive, and unrevisable. Hard information is often taken to correspond to knowledge. In contrast to hard information, soft information is non-necessarily-factive, hence revisable in the presence of new information. Soft information, in virtue of its revisability, corresponds very closely to belief. The terms knowledge and belief are conventional, but on the context of information flow, the hard/soft information reading is convenient on account of it bringing the informational phenomena to the foreground. At the very least the terminology is increasingly popular, so being clear on the distinction being one between types of information storage as opposed to types of information is important. Although both hard and soft information are important for our epistemic and doxastic success, in this section we will concentrate mainly on logics of hard information flow. 