System and method for performing data retention in solid-state memory using an LRU list

Systems and methods for retaining data are disclosed in which refresh copy operations are performed on data stored in non-volatile solid-state memory. A controller may be configured to maintain a list of physical memory locations, the list sorted by a least recently used criterion. The controller may select a first entry from a top of the list and perform a refresh operation to copy data stored in a current physical memory location associated with the first entry to a new physical memory location, and may remove the first entry from the top of the list and add a new entry associated with the new physical memory location to a bottom of the list. The controller may repeat the select, perform, remove and add steps for a plurality of entries in the list, and the steps may be timed such that all refresh operations are performed for all of the plurality of entries within a set period of time.