Robert Carl Barrett

TL;DR: In this article, a track following servo system is described for magnetic tape systems in which magnetic servo track patterns contain transitions recorded at more than on azimuthal orientation across the width of the servo tracks.

TL;DR: In this article, a track following servo system is described for use with magnetic recording media, in which magnetic servo track 27 patterns contain transitions recorded at more than one azimuthal orientation across the width of the servo tracks.

TL;DR: In this article, a track following servo system is described for use with magnetic recording media, in which magnetic servo track 27 patterns contain transitions recorded at more than one azimuthal orientation across the width of the servo tracks.

TL;DR: In this article, the authors proposed a method to detect a position signal error by setting a width of a servo read head to be smaller than half a width for a narrowest data read head when the width is defined as a size of the head in a direction perpendicular to a conversion direction.

Abstract: A track following servo system is disclosed for use with magnetic recording media 20 in which magnetic servo track 27 patterns contain transitions recorded at more than one azimuthal orientation across the width of the servo track The timing of a signal derived from reading at any point across the width of such a pattern varies continuously as the read head is moved across the servo track The pattern is read by a servo read head 26 whose width is small compared to the servo track pattern The combination of a wide servo pattern and a narrow servo read head offers excellent position sensing linearity and dynamic range In the preferred embodiment, the servo read head is also narrow with respect to the data tracks, which provides the additional advantages of superior immunity to position sensing errors caused by defects or temporal variations in the servo read head, defects in the servo pattern, wear of the head, or debris collection Position sensing with this system is achieved by deriving a ratio of two servo pattern intervals and therefore is insensitive to medium speed during reading The servo patterns may include spacing intervals 70 recognizable for error detection and correction purposes The servo tracks may be recorded using a patterned multiple gap servo write head 400 whose magnetic gaps have geometries appropriate to generate the desired servo patterns