1. A memory storage system, comprising: a nonvolatile memory unit having storage locations organized into one or more sub-blocks configured to store sectors of information from a host, wherein one or more sub-blocks define a block; and memory control circuitry coupled to the nonvolatile memory unit and responsive the sectors of information from the host, the sectors of information being identified by sector numbers of a predetermined order; wherein the memory control circuitry is configured to write a sector of information received from the host to a location of a particular sub-block of a particular block that comprises one or more sub-blocks and that is assignable based upon identification of a free location within the memory unit; wherein the memory control circuitry is further configured to write a sector of information received from the host to a location of a sub-block of the particular block that is other than the particular sub-block, regardless of the predetermined order of the sector numbers of the received sectors of information; and wherein the memory control circuitry is further configured to write the sectors of information to the locations of the sub-blocks of the particular block substantially concurrently.