Methods of operating a multi-level non-volatile memory device can include accessing data, stored in the device, which is associated with read voltages and modifying the read voltages applied to a plurality of multi-level non-volatile memory cells to discriminate between states stored by the cells in response to a read operation to the multi-level non-volatile memory device. The system includes a laser, one or more high speed scan heads, a laser marking station and a conveyance device. Since the NFETs in separate wells are physically isolated from each other, a circuit structure which uses two NFETs in the two outer rows is much less likely to suffer multiple upsets from a single radiation strike. The input device mapper maps controls on the available devices into user-requestable software actions by matching, as closely as possible, device controls and software actions that correspond to the same semantic. The segment has a first identifiable end and a second identifiable end.