Dynamic magnetic information storage or retrieval – General processing of a digital signal – Head amplifier circuit
Reexamination Certificate
1998-09-11
2001-04-24
Faber, Alan T. (Department: 2651)
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Head amplifier circuit
C360S051000, C360S077020
Reexamination Certificate
active
06222691
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to methods and apparatus for detecting data, and more particularly to, an interleaved dibit detection apparatus for servo data detection in a direct access storage device.
DESCRIPTION OF THE RELATED ART
Direct access storage devices (DASDs) often incorporating stacked, commonly rotated rigid magnetic disks are used for storage of data in magnetic form on the disk surfaces. Data is recorded in concentric, radially spaced data information tracks arrayed on the surfaces of the disks. Transducer heads driven in a path toward and away from the drive axis write data to the disks and read data from the disks. Typically servo information is provided on one or more disk surfaces for reading by the transducer heads for accurately and reliably positioning transducer heads on the disk surfaces at a specific location to read and write data.
New high performance DASD drives require higher data and servo rates. As channel speeds go faster, conventional arrangements of circuit functions can be a limiting factor in overall performance. In the design of new DASDs, the performance requirements can be more demanding than the channel can deliver with traditional architectures.
A need exists for an improved dibit detection apparatus for high speed servo data detection in a direct access storage device enabling high speed channel operation.
SUMMARY OF THE INVENTION
A principal object of the present invention is to provide an interleaved dibit detection apparatus for servo data detection in a direct access storage device. Other important objects of the present invention are to provide such interleaved dibit detection apparatus for servo data detection in a direct access storage device substantially without negative effects; and to provide such interleaved dibit detection apparatus that overcome some of the disadvantages of prior art arrangements.
In brief, a method for detecting servo data and an interleaved dibit detection apparatus are provided for servo data detection in a direct access storage device. The interleaved dibit detection apparatus includes a new dibit threshold detector for detecting a predefined threshold level of a new interleave servo signal and providing a new detected dibit output. An old dibit threshold detector detects the predefined threshold level of an old interleave servo signal and provides an old detected dibit output. A combining function coupled to the new dibit threshold detector and the old dibit threshold detector provides a combined detected dibit output.
REFERENCES:
patent: 5321559 (1994-06-01), Nguyen et al.
patent: 5608583 (1997-03-01), Shrinkle
patent: 6031672 (2000-02-01), Bergquist et al.
Berquist Mark Andrew
Kertis Robert Andrew
Faber Alan T.
International Business Machines - Corporation
Pennington Joan
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