1. A method of performing operations on a parallel programming unit in a memory system, the method comprising the memory system: performing a first operation on the parallel programming unit, the parallel programming unit comprising multiple physical structures configured to be operated on in parallel, the first operation operating on only some of the multiple physical structures in the parallel programming unit and not operating on a remainder of the parallel programming unit; setting a pointer to indicate at least one physical structure in the remainder of the parallel programming unit; and performing a second operation using the pointer to operate on no more than the remainder of the parallel programming unit by writing only to memory cells in a row, as indicated by the pointer, from a column, as indicated by the pointer, to an end of the row.