1. A method comprising: storing first metadata only at the same addressable storage location of a computer readable medium as that where associated first user data is stored; and after the storing first metadata step, satisfying a read request for the first user data by retrieving the first user data from the addressable location of the computer readable medium where the first metadata is stored if the first metadata has a first value, and by reconstructing the first user data from other metadata stored at another addressable location of the computer readable medium than where the first metadata is stored if the first metadata has a second value.