Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1989-09-27
1991-03-19
Psitos, Aristotelis M.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 76, 360 7802, G11B 556
Patent
active
050015800
ABSTRACT:
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 (152) detects the recorded data pattern (504). The time difference (.DELTA.T.sub.ON) between the event of each head (154, 152) first sensing the data pattern (504), and the time difference (.DELTA.T.sub.OFF) 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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IBM Technical Disclosure Bulletin, vol. 17, No. 6, Nov. 1974, Servo Pattern for Measuring Position Error in Tape Systems, K. Y. Wang, p. 1751.
Aranovsky Anatoly
Buchan William A.
Archive Corporation
Psitos Aristotelis M.
Robertson David L.
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