Dynamic magnetic information storage or retrieval – Record copying
Reexamination Certificate
2007-12-25
2007-12-25
Wellington, Andrea (Department: 2627)
Dynamic magnetic information storage or retrieval
Record copying
C360S016000
Reexamination Certificate
active
11066665
ABSTRACT:
A solution to the problem of long, e-beam mastering times needed for patterning masters for patterned magnetic disk media is disclosed. A process for fabrication of masters takes advantage of the circular symmetry of magnetic disks and reduces the total required mastering time by an order of magnitude over prior art processes. This process relies on e-beam mastering of one small arcuate portion of the master, and then replicating that portion around a circular path on the master several times to create a full disk master. The architecture of this design also corrects for errors in head positioning on the final patterned media disk that may be introduced by the mastering process.
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Bandic Zvonimir Z.
Wu Tsai-Wei
Bracewell & Giuliani LLP
Hitachi Global Storage Technologies Netherlands BV
Kapadia Varsha A.
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