Embedded servo patterning methods and apparatus

Details Embedded servo patterning methods and apparatus Embedded servo patterning methods and apparatus

2005-03-08

2005-03-08

Tran, Sinh (Department: 2651)

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data in specific format

C360S075000, C360S077080

Reexamination Certificate

active

06865042

ABSTRACT:
The present invention involves a recordable disk having a first plurality of S1servo sample wedges in a first servo zone at an outermost position on the disk, a second plurality of S2servo sample wedges in a second servo zone which is radially adjacent the first servo zone, and a third plurality of S3servo sample wedges in a third servo zone which is radially adjacent the second servo zone. The S1servo sample wedges of the first plurality are equally spaced apart circumferentially around the disk by a first angle θ1, the S2servo sample wedges of the second plurality are equally spaced apart circumferentially around the disk by a second angle θ2=θ1*N1, and the S3servo sample wedges of the third plurality are equally spaced apart circumferentially around the disk by a third angle θ3=θ2*N2. Advantageously, S2=S1/N1and S3=S2/N2, the S2servo sample wedges of the second plurality are in radial alignment with every N1th wedge of the S1servo sample wedges of the first plurality, and the S3servo sample wedges of the third plurality are in radial alignment with every N2th wedge of the S2servo sample wedges of the second plurality. The number of servo samples are increased nearer the outer position of the disk for improved track following without increasing the number of servo samples at the inner position, which would undesirably decrease storage capacity, and no significant changes to servo detection hardware and software are required.

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