Quickly written servo-patterns for magnetic media including depositing after writing
AssigneeSeagate Technology LLC
InventorPeter I. Bonyhard
Life of this patent
Estimating the term…
Abstract
Servo-pattern information is magnetically recorded on a product disc by magnetic print-through from a master medium. The master servo-writing medium is brought into close proximity with the product “slave” disc, and the two are subjected to an external magnetic field which assists in transferring magnetic servo-patterns to the slave disc in a print-through process. The preferred external magnetic field alternates and rotates with respect to the master/slave combination. In an alternative product disc structure, the magnetic layer is magnetically altered in a servo-pattern configuration. Non-magnetic portions of the servo pattern are created which define both gray code and servo burst information for the product disc.
Claims20
A method of creating a magnetic disc with a magnetic servo pattern thereon, comprising the steps of:
- aligning a magnetic disc immediately adjacent a servowriter medium, the servowriter medium having a higher coercivity than the magnetic disc, the servowriter medium having a servo-master pattern magnetically stored thereon which defines a plurality of concentric tracks;
- applying a magnetic assist field to the aligned servowriter medium and magnetic disc, the magnetic assist field having a substantially equal magnitude at all tracks on the aligned servowriter medium and magnetic disc;
- rotating the aligned servowriter medium and magnetic disc relative to the magnetic assist field;
- separating the servowriter medium from the magnetic disc;
- and
- after the separating step, depositing an overcoat over the magnetic disc.
A method of creating a magnetic disc having a magnetic servo pattern thereon, comprising the steps of:
- aligning a magnetic disc immediately adjacent a servowriter medium, the servowriter medium having a higher coercivity than the magnetic disc, the servowriter medium having a servo-master pattern magnetically stored thereon which defines a plurality of concentric tracks;
- applying a magnetic assist field to the aligned servowriter medium and magnetic disc to transfer a servo pattern onto the magnetic disc;
- separating the servowriter medium from the magnetic disc;
- and
- after the separating step, depositing an overcoat over the magnetic disc.
A method of creating a magnetic disc having a magnetic servo pattern thereon, comprising the steps of:
- aligning a magnetic disc immediately adjacent a servowriter medium, the servowriter medium having a higher coercivity than the magnetic disc, the servowriter medium having a servo-master pattern magnetically stored thereon which defines a plurality of concentric tracks;
- applying a magnetic assist field to the aligned servowriter medium and magnetic disc to transfer a servo pattern onto the magnetic disc;
- separating the servowriter medium from the magnetic disc;
- and
- after the separating step, depositing a lubricant layer over the magnetic disc.
Dependencies are inferred from the claim text.