MAGNETIC TAPE MEDIUM WITH MAGNETICALLY ENCODED SERVO BAND BURSTS

摘要

A magnetic tape medium includes at least one servo band along a longitudinal extension of the tape medium which at least one servo band comprises servo patterns organized in servo frames for supporting to determine positional information. At least one of the servo frames includes a first burst comprising at least two servo stripes inclined at a first angle with respect to a direction orthogonal to the longitudinal extension of the tape medium, followed by a second burst including at least two servo stripes inclined at a second angle with respect to a direction orthogonal to the longitudinal extension of the tape medium, which second angle is different from the first angle. At least one of the stripes of the first burst has a first magnetic polarity and at least one of the stripes of the second burst has a second magnetic polarity different from the first magnetic polarity.

主权项

1. A method for writing a servo pattern to a magnetic tape medium by a write head, the write head comprising a coil configured to generate a magnetic flux when applying an electric current thereto, a pole piece structure configured to guide the generated magnetic flux, the pole piece structure comprising a first ring structure configured to guide a first portion of the generated magnetic flux, a second ring structure configured to guide a second portion of the generated magnetic flux, and a common section of the first and the second ring structure around which common section the coil is wound, and a section containing a gap in each of the first ring structure and the second ring structure, wherein the magnetic flux is oriented in opposite directions across the gaps, and wherein the sections containing the gaps are oriented in a common plane, the method comprising:
moving the magnetic tape medium with its servo band above the two gaps in a direction along the longitudinal extension of the magnetic tape medium; applying a current pulse to the coil; continuing to move the magnetic tape medium; and applying another current pulse to the coil.