Servo pattern compatible with planarization constraints of patterned media and use of a single master template

摘要

Embodiments described herein provide for robust servo patterns that comply with planarization constraints and also allow use of a single master template for manufacture of both the front and back of a magnetic disk. Planarization constraints are met because only a portion of servo data is hard patterned on the magnetic disk and the hard patterned servo data areas comply with planarization constraints. The servo pattern has two symmetrical servo write assist patterns, one on each side of a central burst pattern. The servo sync, SAM, track-ID, sector-ID, and/or RRO values can be written magnetically by the write head onto these servo write assist patterns after the completion of the planarization process. The symmetric design of the servo pattern allows both a left-to-right and a right-to-left servo write and read back, thereby enabling use of a single master template in magnetic disk manufacture.

主权项

1. A magnetic disk, comprising:
a plurality of servo patterns, each servo pattern comprising a first servo write assist pattern, a central burst pattern bordering the first servo write assist pattern, and a second servo write assist pattern bordering the central burst pattern, wherein the first and second servo write assist patterns are substantially symmetrical to each other about the central burst pattern, and wherein each servo pattern comprises a magnetically written servo sync with at least four magnetic transitions.