1. An apparatus comprising: a processor configured to initiate an operation to recycle a plurality of source blocks in a memory that is nonvolatile; and a circuit configured to (i) search through a first of a plurality of levels in a map that defines a plurality of translations between a plurality of logical addresses used at an interface to a computer and a plurality of physical addresses used in said memory and (ii) notify said processor in response to a detection in said first level of one or more of said source blocks to be recycled that contain valid data.