Calibrated drop-out disk

Details Calibrated drop-out disk Calibrated drop-out disk

1982-02-01

1985-01-01

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

Monitoring or testing the progress of recording

360 25, 360 53, G11B 2736, G11B 1502, G11B 509

Patent

active

044918810

ABSTRACT:
A standardized, calibrated drop-out disk is provided to test disk certification equipment. The disk is a previously certified high quality disk having one or more selected tracks thereon upon which data is recorded at a standard level over some portions of the track and at differing levels on other portions of the track known as drop-out portions. The magnitude and playback amplitude of the drop-out portions is selected to be less than that of the remaining portions of the track. Methods of creating the standardized drop-out disk utilizing either varying write currents delivered to the head for the different portions of the track and/or write heads of different width being utilized are also provided. The standardized drop-out disks are utilized to test the sensitivity and accuracy of disk certification equipment as it is used to test production of magnetic disks.

REFERENCES:
patent: 3947875 (1976-03-01), Bull et al.
"Checking Error-Correcting and Amplitude Sensing Circuitry"--Breitenback et al., IBM TDB, vol. 12, #7, 12/79.
"Read-Channel Test Circuit"--H. Sierra, IBM TDB, vol. 19, #5, 10/76.
"Apparatus for Generating Desired Physical Defects on Magnetic Disks"--Jones et al., IBM TDB, vol. 23, #2, 7/80.

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