Dynamic magnetic information storage or retrieval – Record copying
Reexamination Certificate
2007-11-13
2008-12-02
Wellington, Andrea L (Department: 2627)
Dynamic magnetic information storage or retrieval
Record copying
C360S048000
Reexamination Certificate
active
07460321
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.
REFERENCES:
patent: 4587579 (1986-05-01), Cocke et al.
patent: 5828536 (1998-10-01), Morita
patent: 5930067 (1999-07-01), Andrews et al.
patent: 5995461 (1999-11-01), Sedlmayr et al.
patent: 6058084 (2000-05-01), Yamamoto et al.
patent: 6144517 (2000-11-01), Watanabe et al.
patent: 6421195 (2002-07-01), Rubin et al.
patent: 6590729 (2003-07-01), Akagi et al.
patent: 6611388 (2003-08-01), Miyata et al.
patent: 6643082 (2003-11-01), Belser
patent: 6754032 (2004-06-01), Szita et al.
patent: 6757116 (2004-06-01), Curtiss et al.
patent: 6781785 (2004-08-01), Belser et al.
patent: 2003/0137763 (2003-07-01), Albrecht et al.
Watanabe, Kenjiro, et al., Demonstration of Track Following Technique Based on Discrete Track Media, IEEE Transactions on Magnetics, vol. 29, No. 6, Nov. 1993.
Tanaka, Shoji, et al., Characterization of Magnetizing Process for Pre-Embossed Servo Pattern of Plastic Hard Disks, IEEE Transactions on Magnetics, vol. 30, No. 6, Nov. 1994.
Lee, Ho Seong, Implementation of Adaptive Feedforward Cancellation Algorithms for Pre-Embossed Rigid Magnetic (PERM) Disks, IEEE Transactions on Magnetics, vol. 33, No. 3, May 1997.
Bandic Zvonimir Z.
Wu Tsai-Wei
Bracewell & Giuliani LLP
Hitachi Global Storage Technologies - Netherlands B.V.
Kapadia Varsha A.
Wellington Andrea L
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