Systems and methods for reading data from a storage medium

• US 9,257,135 B2
• Filed: 07/13/2015
• Issued: 02/09/2016
• Est. Priority Date: 07/16/2012
• Status: Active Grant

• Current Assignee: Marvell Asia Pte Limited (Marvell Technology Group Limited)
• Original Assignee: Marvell International Limited (Marvell Technology Group Limited)
• Inventors: Ong, Chun Lian, Yuan, Zhimin, Leong, Siang Huei, Liu, Bo
• Primary Examiner(s): HOLDER, REGINA NEAL
• Application Number:
  US14/797,698
• Publication Number:
  US 20150325257A1
• Time in Patent Office: 211 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: G11B 20/10009 Improvement or modification of read or write signals
• CPC Class Codes: G11B 20/1217 on discs
• CPC Class Codes: G11B 2020/1238 track, i.e. the entire a spirally or concentrically arranged path on which the recording marks are located
• CPC Class Codes: G11B 5/012 Recording on, or reproducing or erasing from, magnetic disks G11B17/00, G11B19/00 take precedence
• CPC Class Codes: G11B 5/02 Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
• CPC Class Codes: G11B 5/09 Digital recording
• CPC Class Codes: G11B 5/59694 System adaptation for working during or after external perturbation, e.g. in the presence of a mechanical oscillation caused by a shock

Abstract

A system for reading data from a storage medium. The system includes a reader and a data determination circuit. The reader is configured to receive a first signal from a first position relative to the storage medium and read a second signal from a second position relative to the storage medium. Each of the first signal and the second signal includes a combination of first data stored in a first track and second data stored in a second track. The data determination circuit is configured to determine third data stored at a predetermined position using the combination of the first data stored in the first track and the second data stored in the second track as received in the first signal and the combination of the first data stored in the first track and the second data stored in the second track as received in the second signal.

Claims

1. A system comprising:

a reader including a reader head, wherein the reader is configured to

(i) receive a first signal from the reader head based on the reader head being at a first position relative to a storage medium, and

(ii) receive a second signal from the reader head based on the reader head being at a second position relative to the storage medium, wherein the second position is different from the first position, and wherein each of the first signal and the second signal includes a combination of first data stored in a first track of the storage medium and second data stored in a second track of the storage medium, and wherein the second position is offset from the first position such that the second position is closer to or further away from the second track than the first position; and

a data determination circuit configured to determine third data stored at a predetermined position of the storage medium using

(i) the combination of the first data stored in the first track and the second data stored in the second track as received in the first signal, and

(ii) the combination of the first data stored in the first track and the second data stored in the second track as received in the second signal.

2. The system of claim 1, wherein the reader head comprises (i) a first read head configured to receive the first signal and (ii) a second read head configured to receive the second signal.

3. The system of claim 1, wherein at least one of the first position and the second position overlaps each of the first track and the second track of the storage medium.

4. The system of claim 3, wherein at least one of the first track and the second track has a width that is less than a width of the reader head of the reader.

5. The system of claim 1, wherein, to determine the third data, the data determination circuit is configured to determine the third data by performing de-convolution on the first signal and the second signal.

6. The system of claim 1, wherein (i) the reader is configured to receive a frequency burst signal from the reader head based on the reader head being at a third position relative to the storage medium, and (ii) to determine the third data, the data determination circuit is configured to determine the third data further based on the frequency burst signal.

7. The system of claim 1, wherein, to determine the third data, the data determination circuit is configured to determine the third data further based on an amplitude coefficient, wherein the amplitude coefficient indicates respective contributions of the first data and the second data.

8. The system of claim 1, wherein, to determine the third data, the data determination circuit is configured to determine the third data further based on at least one of (i) a phase offset of the first data and (ii) a phase offset of the second data.

9. The system of claim 1, wherein, to determine the third data, the data determination circuit is configured to (i) calculate a first portion of the first signal received from the first track, (ii) calculate a second portion of the first signal received from the second track, (iii) calculate a third portion of the second signal received from the first track, (iv) calculate a fourth potion of the second signal received from the second track, and (v) determine the third data based on the calculated first portion, second portion, third portion, and fourth portion.

10. A method, comprising:

receiving a first signal from a reader head based on the reader head being at a first position relative to a storage medium;

receiving a second signal from the reader head based on the reader head being at a second position relative to the storage medium, wherein the second position is different from the first position, and wherein each of the first signal and the second signal includes a combination of first data stored in a first track of the storage medium and second data stored in a second track of the storage medium, and wherein the second position is offset from the first position such that the second position is closer to or further away from the second track than the first position; and

determining third data stored at a predetermined position of the storage medium using

(i) the combination of the first data stored in the first track and the second data stored in the second track as received in the first signal, and

(ii) the combination of the first data stored in the first track and the second data stored in the second track as received in the second signal.

11. The method of claim 10, wherein the reader head includes a first read head and a second read head, wherein receiving the first signal includes receiving the first signal using the first read head, and wherein receiving the second signal includes receiving the second signal using the second read head.

12. The method of claim 10, wherein receiving the first signal includes positioning the reader head to overlap each of the first track and the second track of the storage medium.

13. The method of claim 12, wherein at least one of the first track and the second track has a width that is less than a width of the read head.

14. The method of claim 10, wherein determining the third data includes performing de-convolution on the first signal and the second signal.

15. The method of claim 10, wherein determining the third data includes (i) receiving a frequency burst signal from the reader head based on the reader head being at a third position relative to the storage medium, and (ii) determining the third data further based on the frequency burst signal.

16. The method of claim 10, wherein determining the third data includes determining the third data further based on an amplitude coefficient, wherein the amplitude coefficient indicates respective contributions of the first data and the second data.

17. The method of claim 10, wherein determining the third data includes determining the third data further based on at least one of (i) a phase offset of the first data and (ii) a phase offset of the second data.

18. The method of claim 10, wherein determining the third data includes (i) calculating a first portion of the first signal received from the first track, (ii) calculating a second portion of the first signal received from the second track, (iii) calculating a third portion of the second signal received from the first track, (iv) calculating a fourth potion of the second signal received from the second track, and (v) determining the third data based on the calculated first portion, second portion, third portion, and fourth portion.