A method and system for validating host bus adapters uses two processing passes. The brewing filter structure is designed to create a consistent bed depth and a plurality of wicking points in order to give a more even extraction of the beverage brewing substance and a better taste profile over other standard filter structures. Subsequently, a head-slap sign detector outputs, to the hard disk drive, a signal for retracting a head if the hard disk drive is determined to be in the zero-gravity state as detected by the zero-gravity detection signal. Hence, if an encoded running disparity of an encoded word is RD positive RD, then the running disparity is reversed to RD negative RD.