Defect Skip Algorithm
Original Publication Date: 1986-Nov-01
Included in the Prior Art Database: 2005-Mar-09
A method is described for using hardware to locate disk surface defects utilizing previously recorded defect information, comprising the steps of (1) storing defect locations of a track into a memory array, (2) comparing each upcoming cell location with the next defective cell location from the memory array, and (3) if there is a match, inserting a defect skip. The use of hardware to locate disk surface defects obviates the need for computations required in conventional methods. The figure shows an implementation of the method. Defective cell locations are extracted from the count and home address fields of a track and are stored successively in memory array 1. The current cell location is also extracted from the count and home address fields of a track and is stored in register 2.