An interleaved finite impulse response (FIR) filter apparatus is provided for data detection in a direct access storage device. The FIR filter includes a plurality of sample and hold circuits. Each sample and hold circuit samples an input signal sequentially at a clock rate. At least one set of multiple multipliers is coupled to the plurality of sample and hold circuits. Each multiplier multiplies a sample by a predefined value and provides a multiplier product at the clock rate. At least a pair of summing functions are coupled to the set of multipliers. Each summing function adds a predetermined combination of respective multiplier products and provides at least a pair of interleave outputs. Each of the interleave outputs is provided at less than the clock rate.