1. A method of operating a flash device, comprising: selecting a single program and erase entity in a sector of the flash device for erasure, the single program and erase entity comprising two adjacent dual bit physical memory cells of the flash device as a single logical cell, wherein the two adjacent dual bit physical memory cells share a common bitline, and wherein the single program and erase entity in the sector is selected for erasure without selection of other single program and erase entities in the sector for erasure being required; and erasing the single program and erase entity.