Write gate timing for a servo bank
View Patent ↗A recording system records sector information on a recording medium, such as a hard disc drive, using a write gate signal. Timing of the write gate signal enables writing a servo data patterns over the servo wedge fields of the disc and, if the hard disc drive contains prior recorded data, writing null data over selected sector segments of the hard disc.
1. An apparatus for recording one or more servo data patterns to a recording medium, the apparatus comprising:
a write gate controller adapted to generate a write gate signal, the write gate signal allowing for writing of data to the recording medium by a write head,
wherein timing of the write gate signal enables the write head to 1) write a servo data pattern as the data to a corresponding servo data segment of the recording medium and, 2) if the recording medium includes prior recorded data, write null data as the data over selected sector segments of the recording medium.
2. The invention as recited in claim 1 , wherein the timing of the write gate signal enables the write head to write the null data over alternating sector segments.
3. The invention as recited in claim 1 , wherein:
the apparatus is embodied in an integrated circuit of a magnetic recording system that includes a magnetic hard drive disc and a head stack assembly;
the servo data segment is a servo wedge field of a hard disc having a wedge-based servo sector configuration;
the apparatus comprises a write gate and a preamplifier coupled to the write head;
the write head is adapted to write the data to the recording medium;
the write gate signal is applied to the write gate to transfer the data to the preamplifier; and
the preamplifier provides one or more of the servo data pattern and the null data as the data to the write head.
4. The invention of claim 1 , wherein:
the recording medium has a plurality of servo data segments used for storing servo-positioning data; and
the servo data segments are interleaved with a plurality of sector segments used for storing non-servo-positioning data.
5. The invention of claim 4 , wherein the null data is written to only one or more entire sector segments.
6. The invention of claim 5 , wherein the apparatus is adapted to select the one or more sector segments on which to write the null data.
7. The invention of claim 4 , wherein no portion of the null data is written to any servo data segments.
8. A method of recording one or more servo data patterns to a recording medium, the method comprising the steps of:
(a) generating a write gate signal for writing of data to the recording medium by a write head,
(b) adjusting timing of the write gate signal to 1) write a servo data pattern as the data to a corresponding servo data segment of the recording medium and, 2) if the recording medium includes prior recorded data, write null data as the data over selected sector segments of the recording medium.
9. The invention as recited in claim 8 , wherein step (b) adjusts the timing of the write gate signal to enable the write head to write the null data over alternating sector segments.
10. The invention as recited in claim 8 , wherein:
the method is implemented by a processor in an integrated circuit of a magnetic recording system;
the servo data segment is a servo wedge field of a hard disc having a wedge-based servo sector configuration;
a write gate adapted to generate the write sate signal and a preamplifier are coupled to the write head; and
step (b) comprises the step of applying the write gate signal to the write gate to transfer the data to the preamplifier.
11. The invention of claim 8 , wherein:
the recording medium has a plurality of servo data segments used for storing servo-positioning data; and
the servo data segments are interleaved with a plurality of sector segments used for storing non-servo-positioning data.
12. The invention of claim 11 , wherein the null data is written to only one or more entire sector segments.
13. The invention of claim 12 , further comprising selecting the one or more sector segments on which to write the null data.
14. The invention of claim 11 , wherein no portion of the null data is written to any servo data segments.
15. A computer-readable medium having stored thereon a plurality of instructions, the plurality of instructions including instructions which, when executed by a processor, cause the processor to implement a method for recording one or more servo data patterns to a recording medium, the method comprising the steps of:
(a) generating a write gate signal for writing of data to the recording medium by a write head,
(b) adjusting timing of the write gate signal to 1) write a servo data pattern as the data to a corresponding servo data segment of the recording medium and, 2) if the recording medium includes prior recorded data, write null data as the data over selected sector segments of the recording medium.
16. The invention of claim 15 , wherein:
the recording medium has a plurality of servo data segments used for storing servo-positioning data; and
the servo data segments are interleaved with a plurality of sector segments used for storing non-servo-positioning data.
17. The invention of claim 16 , wherein the null data is written to only one or more entire sector segments.
18. The invention of claim 17 , wherein the method further comprises selecting the one or more sector segments on which to write the null data.
19. The invention of claim 16 , wherein no portion of the null data is written to any servo data segments.