Servo band verification in linear tape systems having timing-bas

Details Servo band verification in linear tape systems having timing-bas Servo band verification in linear tape systems having timing-bas

1998-03-04

2000-02-29

Kim, W. Chris

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data verification

360 63, 360 7712, G11B 509, G11B 1512, G11B 5584

Patent

active

06031673&

ABSTRACT:
A device for formatting a linear data storage tape includes a servo write head configured to write a pattern of magnetic transition stripes along a servo band of the linear data storage tape. The servo write head is configured to produce stripes having lateral widths that are significantly greater than that of a servo read element of a data read/write head designed for use with the linear data storage tape. Each stripe has either a positive non-zero azimuth or a negative non-zero azimuth. The device also includes a magnetic readback element that produces a servo verify signal. The magnetic readback element extends laterally across the full widths of the magnetic transition stripes and is oriented at an azimuth between the positive and negative non-zero azimuths of the magnetic transition stripes. A pulse detector is configured to detect pulses in the servo verify signal. Defect detection logic counts the numbers of pulses in the servo verify signal and compares such numbers with expected numbers to detect defects. Defects are also detected by identifying any pulses that exceed a predefined maximum threshold.

REFERENCES:
patent: 5523904 (1996-06-01), Saliba
patent: 5689384 (1997-11-01), Albrecht et al.
patent: 5949607 (1999-09-01), Kalfs et al.

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