Systems and methods for two-step reference pattern self-servowriting
View Patent ↗A two-step self-servowriting process first writes an intermediate pattern based on a reference pattern, and then writes a final pattern based on the intermediate pattern, wherein the reference pattern can be a printed media or a spiral pattern. Such an approach can be utilized to reduce the noise/runout, eliminate timing eccentricity, and increase the sample rate of the final pattern. This description is not intended to be a complete description of, or limit the scope of, the invention. Other features, aspects, and objects of the invention can be obtained from a review of the specification, the figures, and the claims.
1. A method for two-step self-servowriting, comprising:
storing one or more patterns on a plurality of servo tracks on a surface of a rotatable medium, wherein the one or more patterns can include at least one of a reference pattern, an intermediate pattern and a final pattern, wherein the reference pattern is not created by a servowriter or a media writer;
positioning a read/write head relative to the surface of the rotatable medium;
writing the intermediate pattern based on the reference pattern via the read/write head; and
writing the final pattern based on the intermediate pattern via the read/write head.
2. The method according to claim 1 , wherein:
the reference pattern can be a printed media pattern or a spiral pattern.
3. The method according to claim 1 , wherein:
each of the one or more patterns can include one or more wedges, wherein each of the one or more wedges can include on a servo track in the plurality of servo tracks at least one of an index, a SAM, a zig phase burst, a zag phase burst, and a timing burst.
4. The method according to claim 3 , wherein:
the zig burst and the zag burst can have different phases.
5. The method according to claim 1 , further comprising:
writing the intermediate pattern to be superior to the reference pattern in at least one of the following ways:
a wedge in the intermediate pattern can be smaller in size than a wedge in the reference pattern; and
the intermediate pattern can have one or more of: higher frequency, lower PES noise, smaller RRO, and more uniformly spaced than the reference pattern.
6. The method according to claim 5 , further comprising:
writing the intermediate pattern to have less timing eccentricity than the reference pattern.
7. The method according to claim 1 , further comprising:
writing the intermediate pattern to have essentially the same number of wedges as the reference pattern.
8. The method according to claim 1 , further comprising:
writing the intermediate pattern to have essentially the same or higher frequency than the final pattern.
9. The method according to claim 1 , further comprising:
writing the intermediate pattern to have essentially the same or lower PES noise than the final pattern.
10. The method according to claim 1 , further comprising:
writing the intermediate pattern to have essentially the same wedge size as the final pattern.
11. The method according to claim 1 , further comprising:
writing the final pattern to have smaller RRO than the intermediate pattern.
12. The method according to claim 1 , further comprising:
writing the final pattern to have higher number of wedges than the intermediate pattern.
13. The method according to claim 1 , further comprising:
performing at least one of the following operations before writing the intermediate pattern:
observing and calculating the WORF and/or PES information of the reference pattern; and
adjusting the read/write head to reduce the runout.
14. The method according to claim 1 , further comprising:
performing at least one of the following operations before writing the final pattern:
observing and calculating the WORF and/or PES information of the intermediate pattern; and
adjusting the read/write head to reduce the runout.
15. The method according to claim 1 , further comprising:
erasing a wedge of the reference pattern; and
writing a wedge of the final pattern in place of the wedge of the reference pattern.
16. A system for two-step self-servowriting, comprising:
a rotatable medium including a surface having a plurality of servo tracks operable to store one or more patterns including at least one of a reference pattern, an intermediate pattern and a final pattern, wherein the reference pattern is not created by a servowriter or a media writer;
a read/write head including:
a read element operable to read the one or more patterns; and
a write element operable to write the intermediate and/or the final pattern; and
one or more controllers operable to:
position the read/write head relative to the surface of the rotatable medium;
write the intermediate pattern based on the reference pattern via the read/write head; and
write the final pattern based on the intermediate pattern via the read/write head.
17. The system according to claim 16 , wherein:
the rotatable medium can be a magnetic disk, an optical disk, laser-recordable disk, a disk in a single and/or multi-headed disk drive, or a rotatable data storage device.
18. A system for two-step self-servowriting, comprising:
means for storing one or more patterns on a plurality of servo tracks on a surface of a rotatable medium, wherein the one or more patterns can include at least one of a reference pattern, an intermediate pattern and a final pattern, wherein the reference pattern is not created by a servowriter or a media writer;
means for positioning a read/write head relative to the surface of the rotatable medium;
means for writing the intermediate pattern based on the reference pattern via the read/write head; and
means for write the final pattern based on the intermediate pattern via the read/write head.