Early warning for boundary position in serpentine recording

Details Early warning for boundary position in serpentine recording Early warning for boundary position in serpentine recording

1997-01-24

1999-09-28

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

360 722, G11B 1552

Patent

active

059598000

ABSTRACT:
In serpentine recording on magnetic tape (32), a warning marker (CEW) is generated and recorded on tape in a write mode and is read in a read mode. The warning marker indicates that a head is approaching a boundary position on the tape at which the head must change tracks in order to continue recording or reading frames. The warning marker is preferably included in an auxiliary portion of at least some frames. In one embodiment, the warning marker has a value related to a number of frames that can yet be recorded on the track before the boundary position is encountered. Monitoring of the warning marker serves to apprise the drive of a potential need to cache data in anticipation of a change of track. Caching of data can occur either by sending a caching signal to the host, or can occur internally in the drive without taxing the drive's buffer. In the drive-internal caching, the relative speed between the tape and the head is adjusted in anticipation of the head being repositioned for a change of track.

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