The present invention relates to a disk drive 10 comprising a cache memory 14 and a cache control system having a tag memory having a plurality of tag records, and means for allocating a tag record for responding to a host command. Said memory means, responsive to said detection means, contains data on how the status of a nozzle is varying over time. The quantizer can be used for providing a digital signal with a required number of bits, and the quantization interval can be adjusted. The bar may be supported by a plurality of flat leaf springs, which are inclined to the horizontal at for example 30. , the switch matrix is to be reconfigured, a switch control circuit supplies additional switch configuration data to the frames through the inputs along with additional user information to be routed through the switch. At this time, the black frame is displayed on the liquid crystal unit.