Detector for Eliminating Readback Errors from Disk File
Original Publication Date: 1981-Mar-01
Included in the Prior Art Database: 2005-Feb-11
Detector 10 eliminates readback errors from magnetic disk 12 and particularly from unwanted signal peaks caused by (1) shouldering due to low data density (as from the outer track on disk 12), (2) signal pickup from adjacent magnetic tracks due to track misregistration or high track density, and (3) general noise at frequencies close to the channel frequencies. Detector 10 accomplishes this by using the following algorithm: Zero crossings in the differentiated signal from disk 12 will be called a data peak if (1) the signal is above a prescribed threshold after a prescribed time interval and (2) the sign of the peak (or sign of the slope after zero crossing) has reversed from the previous data peak.