System for reading data from a distorted magnetic tape media

Details System for reading data from a distorted magnetic tape media System for reading data from a distorted magnetic tape media

1998-04-27

2000-03-14

Kim, W. Chris

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data verification

360 31, 360 744, G11B 509, G11B 2736, G11B 1548

Patent

active

060380926

ABSTRACT:
A characteristic of helical scan tracks is that a distortion that occurs in the written data tracks is not uniform over the entire length of the track. Therefore, segments of the helical scan track can be read even though the entirety of the helical scan track cannot be read in a single pass. Therefore, laterally moving the read heads a predetermined distance in a selected direction to access a section of the helical track can produce full amplitude read signals and thereby that section of helical scan track can be read. Once a section of the helical scan track is read, the read heads are moved another incremental distance to access a next section of the distorted helical scan track. Each section of the track is thereby read on a different helical scan as the read heads are incrementally repositioned on each scan. The read sections of the helical scan track are stored in the memory of the tape drive control unit and then used to reconstruct the entirety of the track. This enables the tape drive system to recover the entirety of the distorted helical scan track and data is not lost.

REFERENCES:
patent: 5416642 (1995-05-01), Nakagawara et al.
patent: 5521769 (1996-05-01), Suga et al.
patent: 5969898 (1999-10-01), Hansen et al.

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