Technologies are generally described for systems, devices and methods effective to operate a memory device. A memory controller may compress initial data to produce compressed data. The memory controller may select a storage block in the memory device. The memory controller may identify one or more positions of defective cells in the selected storage block. The memory controller may manipulate the compressed data based on the identified one or more positions to produce manipulated data. The memory controller may store the manipulated data in the selected storage block.