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On head microelectronics for write synchronization

A circuit, circuit technology, applied in the field of microelectronic circuits on the head used for writing synchronization

Active Publication Date: 2011-04-27
SEAGATE TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So one of the difficulties with BPM is getting the head right over the bit of interest during writing

Method used

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  • On head microelectronics for write synchronization
  • On head microelectronics for write synchronization
  • On head microelectronics for write synchronization

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Experimental program
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Embodiment Construction

[0015] In magnetic storage media, the magnetic recording layer includes a thin film of magnetic alloy that forms random nanoscale grains that behave as individual magnetic elements. Each written bit is made up of many such random grains. In bit-patterned media (BPM), the magnetic layer is pre-patterned with an ordered array of patterned bits, each patterned bit capable of storing an independent bit of data. BPMs can be pre-patterned by various processes such as, but not limited to, photolithography, ion milling, and the like. Other types of storage media exist, including digital tapes and floppy disks. The presently disclosed technology can be applied to various types of magnetic media storage.

[0016] The time between bit detection using a read sensor and / or bit detector and bit writing is critical in correctly writing data to a bit location on a medium (eg, a disk drive). Current magnetic recording systems generally require the detected data to be sent from the transduce...

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PUM

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Abstract

The presently disclosed technology teaches integrating disc drive electronics into a transducer head. Decreased electrical transit times and data processing times can be achieved by placing the electronics on or within the transducer head because electrical connections may be made physically shorter than in conventional systems. The electronics may include one or more of a control system circuit, a write driver, and / or a data buffer. The control system circuit generates a modified clock signal that has a fixed relation to phase and frequency of a bit-detected reference signal that corresponds to positions of patterned bits on the disc. The write driver writes outgoing data bits received from an external connection to off-head electronics directly to the writer synchronized with the modified clock signal. The data buffer stores and converts digital data bits sent from the off-head electronics to an analog signal that is synchronized with the modified clock signal.

Description

Background technique [0001] During a write operation to the receiving medium by the transducer head, the transducer head uses a magnetic readout sensor to read the upper-track at the write location to ensure that the desired data track is aimed during the write operation. As the areal density, or bit density, of the media increases, it becomes increasingly difficult to maintain a consistent track between the read sensor and the write pole on the transducer head. [0002] Furthermore, in a continuing effort to increase areal density, media have been designed with arrays or patterned cells, where each cell can hold a bit of data (bit-patterned media (BPM)). In such a BPM, data can be stored in independent cells along data tracks defined by patterned bits. However, each patterned bit is temporally synchronized with each data bit. Otherwise, data insertion may occur on incorrectly patterned bits, or data may be written skipping patterned bits. Thus, one challenge with BPM is ge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B5/58
CPCG11B2220/252G11B5/3133G11B5/82G11B20/10222G11B20/10009G11B20/10388G11B20/1024G11B20/10425G11B5/746B82Y10/00G11B2005/0005G11B5/02
Inventor M·A·格宾斯R·W·兰伯顿R·E·温斯坦J·J·塔奇顿
Owner SEAGATE TECH LLC