Patent ID: 7085666
Filing Date: 2006-08-01
Classification: G11B

Abstract:
1. A magnetic head testing apparatus, comprising: reference information storing means for holding a predetermined reference sampling period and a reference number of samplings; sampling means for sampling reproduced data read out a plurality of times from a magnetic medium in said predetermined reference sampling period; sampling number acquiring means for obtaining a sampling number of measured data from said reproduced data based on a result of sampling; sampling number ratio calculating means for calculating a ratio of said sampling number of said measured data and a reference sampling number; sampling data re-acquiring means for changing said sampling period of said measured data and re-acquiring sampling data depending on said calculated ratio; and measured data overlap-displaying means for overlap-displaying said sampling data re-acquired from a plural of measured data, wherein said sampling number acquiring means further includes average value acquiring means for obtaining each average value of a difference between peak phases of preamble and postamble from said reproduced data having preamble, measured data, and postamble.