Read assembly, data storage system, and methods of using the same

Patent metadata

Field	Value
Publication number	US-2016140989-A1
Application number	US-201414900023-A
Country	US
Kind code	A1
Filing date	Jun 25, 2014
Priority date	Jun 26, 2013
Publication date	May 19, 2016
Grant date	—

Abstract

In various embodiments, a read assembly for reading a dual-layered medium may be provided. The dual-layered medium may include a servo layer and a data layer over the servo layer. The read assembly may include a data read head configured to read the data layer. The read assembly may also include a servo read head configured to read the servo layer.

First claim

1 . A read assembly for reading a dual-layered medium, the dual-layered medium comprising a servo layer and a data layer over the servo layer, the read assembly comprising:
a data read head configured to read the data layer; and a servo read head, separate from the data read head, configured to read the servo layer.

2 . The read assembly according to claim 1 ,
wherein the data read head comprises:
a first shield structure;
a second shield structure; and
a sensor between the first shield structure and the second shield structure.

3 . The read assembly according to claim 2 ,
wherein the servo read head comprises
a third shield structure;
a fourth shield structure; and
another sensor between the third shield structure and the fourth shield structure;
wherein a first distance defined between the first shield structure and the second shield structure is smaller than a second distance defined between the third shield structure and the fourth shield structure.

4 . The read assembly according to claim 1 , further comprising:
an isolation layer between the data read head and the servo read head.

5 . The read assembly according to claim 3 ,
wherein the sensor is a first magnetoresistance sensor; and wherein the other sensor is a second magnetoresistance sensor.

6 . The read assembly according to claim 1 ,
wherein the data read head and the servo read head are positioned over the dual-layered medium with the data layer closer to both the data read head and the servo read head than the servo layer.

7 . The read assembly according to claim 1 , further comprising:
a further servo read head configured to read the servo layer.

8 . The read assembly according to claim 7 ,
wherein the data read head is positioned between the servo read head and the further servo read head.

9 . The read assembly according to claim 7 ,
wherein the servo read head is positioned between the data read head and the further servo read head.

10 . The read assembly according to claim 1 , further comprising:
one or more further data read heads.

11 . A data storage system comprising:
a dual-layered medium; and a read assembly according to claim 1 ; wherein the read assembly is configured to read the dual-layered medium in a read direction.

12 . The data storage system according to claim 11 ,
wherein the servo read head is positioned in front of the data read head in the read direction.

13 . The data storage system according to claim 11 ,
wherein the servo read head is positioned behind the data read head in the read direction.

14 . The data storage system according to claim 11 ,
wherein the dual-layered medium is a ring-shaped disk having an inner circumference and an outer circumference substantially parallel to the inner circumference; wherein the inner circumference defines an inner circumferential wall extending at least over a thickness of the servo layer and a thickness of the data layer; and wherein the outer circumference defines an outer circumferential wall extending at least over the thickness of the servo layer and the thickness of the data layer.

15 . The data storage system according to claim 14 ,
wherein the dual-layered medium comprising a plurality of tracks substantially parallel to the inner circumference and the outer circumference.

16 . The data storage system according to claim 15 ,
wherein the data read head and the servo read head are arranged so that a projection of the data read head on the medium and a projection of the servo read head on the medium are laterally along one track of the plurality of tracks at any time.

17 . The data storage system according to claim 15 ,
wherein the plurality of tracks comprises: a plurality of data tracks on the data layer; and a plurality of servo tracks on the servo layer.

18 . The data storage system according to claim 17 ,
wherein each track of the plurality of tracks has a predetermined track width; and wherein a data track is arranged from a neighbouring servo track by half a track width.

19 . The data storage system according to claim 17 ,
wherein each data track has a first predetermined track width; wherein each servo track has a second predetermined track width; and wherein the first predetermined track width is different from the second predetermined track width.

20 . The data storage system according to claim 17 ,
wherein the data read head is configured to be positioned over the data track; and wherein the servo read head is configured to be positioned over a the neighbouring servo track.

21 . The data storage system according to claim 20 ,
wherein a width of the servo read head is different from a width of the data read head.

22 . The data storage system according to claim 20 ,
wherein a spacing between the servo read head and the dual-layered medium is different from a spacing between the data read head and the dual-layered medium.

23 . A method of using a read assembly to read a dual-layered medium, the dual-layered medium comprising a servo layer and a data layer over the servo layer, the method comprising:
providing a read assembly over the dual-layered medium, the read assembly comprising a data read head and a servo read head separate from the data read head; and reading the data layer using the data read head and reading the servo layer using the servo read head.

Assignees

• Marvell Int Ltd

Inventors

• Chen Yunjie
• Leong Siang Huei
• Liu Bo

Classifications

• G11B5/4886 Primary

  relative to rotating disc · CPC title

• G11B2020/1238

  track, i.e. the entire a spirally or concentrically arranged path on which the recording marks are located · CPC title

• G11B20/1217

  on discs · CPC title

• G11B5/3912

  Arrangements in which the active read-out elements are transducing in association with active magnetic shields, e.g. magnetically coupled shields (G11B5/3916 takes precedence) · CPC title

• G11B5/3974

  from the same information track, e.g. frequency bands · CPC title