APPARATUS AND METHOD OF GENERATING A TEST PATTERN OF DATA, ANALYSING A TEST PATTERN OF DATA, AND TESTING A DATA STORAGE DISK MEDIUM AND/ OR A READ/ WRITE HEAD

摘要

A METHOD OF GENERATING A TEST PATTERN OF DATA (58) TO BE WRITTEN TO A DATA STORAGE DISK MEDIUM FOR TESTING INCLUDES: ROTATING THE DISK (4); DETECTING FLUCTUATIONS IN THE SPEED OF ROTATION OF THE DISK (4); PRODUCING A REFERENCE CLOCK SIGNAL (53) IN ACCORDANCE WITH THE FLUCTUATIONS SO AS TO BE SYNCHRONIZED WITH THE ROTATION OF THE DISK (4); AND, GENERATING A TEST PATTERN OF DATA (58) USING THE REFERENCE CLOCK SIGNAL (53) AS A TIMING REFERENCE. AN APPARATUS FOR GENERATING A TEST PATTERN OF DATA (58) INCLUDES A SPINDLE (2) FOR ROTATING A DISK (4); A DETECTOR ARRANGED TO DETECT FLUCTUATIONS IN THE SPEED OF ROTATION OF THE DISK (4); A PROCESSOR ARRANGED TO PRODUCE A REFERENCE CLOCK SIGNAL (53) IN ACCORDANCE WITH FLUCTUATIONS SO AS TO BE SYNCHRONIZED WITH THE ROTATION OF THE DISK (4); AND, A PATTERN GENERATOR (16) ARRANGED TO GENERATE A TEST PATTERN OF DATA (58) USING THE REFERENCE CLOCK SIGNAL (53) AS A TIMING REFERENCE. (FIG. 1)