Method to compensate for tape slope and head azimuth errors

Details Method to compensate for tape slope and head azimuth errors Method to compensate for tape slope and head azimuth errors

G - Physics

11

B

352/21.31

G11B 20/20 (2006.01) G11B 5/55 (2006.01) G11B 5/584 (2006.01)

Patent

CA 2008477

METHOD TO COMPENSATE FOR TAPE SLOPE AND HEAD AZIMUTH ERRORS Abstract of the Disclosure A method is provided to compensate for tape slope (A) and read/write head block (102) azimuth (B) errors in a tape drive system (100). The method writes a data pattern (504) on a magnetic medium (104) at a known slope (C). The portion of the magnetic medium (104) that is encoded with the data pattern (504) is then moved across the read/write head block (102), so that first one read head (154) and then the other read head (1523 detects the recorded data pattern (504). The time difference (.DELTA.TON) between the event of each head (154, 152) first sensing the data pattern (504), and the time difference (.DELTA.TOFF) between the points where each head (154, 152) no longer detects the data pattern (504), are both recorded. The recorded information is used to analyze the angular offset (A-B) between the centerline (192) of the tape (104) and the centerline (194) of the read/write head system (102). The angular offset (A-B) is used to determine a lateral displacement (D) between the two read heads (154, 152) in a direction perpendicular to the centerline (192) of the tape (104). The lateral displacement (D) is used to adjust the stepping distance between data tracks recorded in a first (i.e., forward) direction and a second (i.e., reverse) direction on the tape (104) so that the respective read head (152, 154) is positioned substantially on the center of the respective recorded track.

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