Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1997-07-29
1999-08-10
Edun, Muhammad
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 7807, 360 75, G11B 5596
Patent
active
059367890
ABSTRACT:
An off-track characteristics tester for testing an off-track characteristics of an MR head, according to the present invention, comprises spiral scan type read-out unit for reading out a test data recorded on a track of a disk by spirally scanning the track by the MR head while shifting the MR head radially of the disk at such a shifting rate that the MR head traverses a maximum measuring pitch .DELTA.R necessary to obtain data of an off-track profile curve a plurality of times, average value calculation unit responsive to a read-out signal from the read-out unit to calculate an average value TAA of the test data from the read-out unit every revolution of the disk and a memory for storing the average value TAA for each revolution of the disk together with the radial positions of the MR head, wherein the data of the off-track profile curve is obtained from the average value TAA and the data of the radial positions stored in the memory in every revolution.
REFERENCES:
patent: 4458275 (1984-07-01), Monti
patent: 5579119 (1996-11-01), Mimura
patent: 5808435 (1998-09-01), Mager
Edun Muhammad
Hitachi Electronics Engineering Co. Ltd.
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