1. A nonvolatile memory system comprising: a nonvolatile memory array that stores data from a host and stores a file system structure that indicates allocation of the data by the host to at least a first portion of a logical address space; a controller that manages data in the nonvolatile memory array, the controller allocating at least a second portion of the logical address space without indicating the allocation of the second portion in the file system structure; and a volatile memory that records allocation of the second portion of the logical address space by the controller.