Magnetic disk device and reference pattern writing method of the same
US-2024079028-A1 · Mar 7, 2024 · US
Methods of demodulating a servo position error signal on patterned media
US9583137B1 · US · B1
| Field | Value |
|---|---|
| Publication number | US-9583137-B1 |
| Application number | US-201213715980-A |
| Country | US |
| Kind code | B1 |
| Filing date | Dec 14, 2012 |
| Priority date | Nov 17, 2008 |
| Publication date | Feb 28, 2017 |
| Grant date | Feb 28, 2017 |
How to read this patent
A practical reading order for non-experts. Skip the full description unless you need deep technical detail.
- Title
What the patent document calls the invention.
- Abstract
A short plain-language summary of the technical disclosure.
- Assignees and inventors
Who owns or filed the patent and who is credited as inventor.
- Key dates
Filing, priority, publication, and grant dates set the timeline.
- First independent claim
The legal scope of protection — read this for what is actually claimed.
- CPC / IPC classifications
Technology tags used to group this patent with similar filings.
- Citations and related patents
Prior art links and similar publications in this corpus.
Abstract
Official abstract text for this publication.
A system includes, in at least one aspect, a storage device including patterned media and a head; and a read channel configured to: receive a DC readback signal from the head, the DC readback signal including position error signal (PES) information associated with a position of the head with respect to the patterned media, and determine the position of the head with respect to the patterned media based on a result of summing the DC components of the PES information.
First claim
Opening claim text (preview).
What is claimed is: 1. A system comprising: a storage device including patterned media and a head; and a read channel configured to: receive a direct current (DC) readback signal from the head, the DC readback signal including position error signal (PES) information associated with a position of the head with respect to the patterned media, and determine the position of the head with respect to the patterned media based on a result of summing DC components of the PES information. 2. The system of claim 1 , wherein the patterned media includes a magnetic layer created as an ordered array of uniform discrete data islands, each of the islands storing an individual bit. 3. The system of claim 1 , wherein the patterned media comprises a single continuous sequence of bits in a same polarity from which the DC readback signal is generated. 4. The system of claim 1 , wherein the read channel is further configured to provide DC coupling to allow the DC components in the DC readback signal to pass. 5. The system of claim 1 , wherein the read channel is further configured to provide near-DC coupling such that a DC offset in the DC readback signal is rejected while allowing the DC components in the DC readback signal to pass. 6. The system of claim 1 , wherein the read channel comprises an analog to digital converter to convert the DC readback signal to a digital signal before summing the DC components of the PES information. 7. The system of claim 1 , wherein the read channel is further configured to low-pass filter the DC readback signal before summing the DC components of the PES information. 8. The system of claim 7 , wherein the read-channel comprises an analog front end that constitutes a low-pass filter.
Assignees
Inventors
Classifications
- G11B5/59688Primary
Servo signal format patterns or signal processing thereof, e.g. dual, tri, quad, burst signal patterns · CPC title
- G11B21/02Primary
Driving or moving of heads · CPC title
Bit Patterned record carriers, wherein each magnetic isolated data island corresponds to a bit · CPC title
Sector, sample or burst servo format · CPC title
Patent family
Related publications grouped by family.
External sources
Frequently asked questions
Answers are generated from the same data shown on this page.
- What does patent US9583137B1 cover?
- A system includes, in at least one aspect, a storage device including patterned media and a head; and a read channel configured to: receive a DC readback signal from the head, the DC readback signal including position error signal (PES) information associated with a position of the head with respect to the patterned media, and determine the position of the head with respect to the patterned med…
- Who is the assignee on this patent?
- Marvell Int Ltd, Marvell Int Ltd
- What technology area does this patent fall under?
- Primary CPC classification G11B5/59688. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Feb 28 2017 00:00:00 GMT+0000 (Coordinated Universal Time) (B1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).