Erasure and servowriting of magnetic storage media having perpendicular anistropy

摘要

Magnetic storage tape and techniques for erasing and writing to magnetic storage tape having a perpendicular squareness greater than 50 percent and a longitudinal squareness less than 50 percent are described. In general, the magnetic tape may be biased with a remanence magnetization, or magnetic orientation, in any direction. One or two head systems may use various magnetic field patterns to create the desired remanence magnetization. Servo marks may have a remanence magnetization in an opposite magnetic orientation than that of the remaining bias on the servo track, e.g., substantially perpendicular to the magnetic tape. In some examples, a write head may alternate the direction of the magnetic field to continuously bias and write servo patterns to the magnetic tape. In addition, a symmetrical servo mark may be created in the magnetic tape with a write head having a gap width approximately equal to the length of the servo mark.

主权项

1. A data storage tape comprising:
a substrate; a magnetic layer formed over the substrate, wherein the magnetic layer comprises a perpendicular squareness greater than 50 percent and a longitudinal squareness less than 50 percent; a servo track on the magnetic layer; a servo pattern in the servo track, wherein the servo pattern comprises a plurality of servo marks each comprising a pattern remanence magnetization in a first directional octant that borders a perpendicular plane perpendicular to both the substrate and a length of the substrate and is disposed on a first side of a longitudinal plane parallel to the substrate; and a non-pattern area in the servo track, wherein the non-pattern area has a non-pattern remanence magnetization in a second directional octant bordering the perpendicular plane and disposed on a second side of the longitudinal plane opposite the first side.