Method and apparatus for reducing data loss errors in a magnetic tape device

摘要

A method and associated apparatus for reduction of data loss errors in computer data tape transport applications. In tape transport devices with moveable read heads (i.e. auto-tracking read/playback heads), by sensing telemetry information regarding tape movement and alignment of a position on the tape medium before the position on the tape encounters the moveable head. Prior systems provided for such sensing only as the tape was read by the moveable head such that compensation could be made only for subsequent read operation. By sensing the telemetry data in advance of the tape encountering the moveable head, the head may be adjusted in time to encounter the misaligned tape medium compensating for the misalignment. Similarly, telemetry data relating to the speed of the tape motion as sensed by a channel reading a predetermined recorded sequence of bits permits compensation for both erroneous tape speed and tape medium stretch or contraction.