A memory controller (16) is used in a system (10) having a main memory (22) and a set of non-volatile memories (26, 32, 38, 44). Each non-volatile memory comprises a plurality of sectors (S0-S28), pages, or other memory unit types. A command is received to write data to the set of non-volatile memories (26, 32, 38, 44). Within the data is identified a grouping of the data that is for writing to sectors in the set of non-volatile memories in which each non-volatile memory of the set of non-volatile memories is to be written and each sector to be written has a corresponding location to be written in all of the other non-volatile memories. Corresponding locations are locations that are in the same location in the sequential order. The grouping of data is written into the set of the non-volatile memories to result in the writing in the non-volatile memories occurring contemporaneously.