Method and apparatus for providing write current optimization

Details Method and apparatus for providing write current optimization Method and apparatus for providing write current optimization

2001-10-15

2004-09-14

Hudspeth, David (Department: 2651)

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of biasing or erasing

C360S031000, C360S053000

Reexamination Certificate

active

06791780

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates in general to disk storage systems and more particularly, to methods and apparatus for providing write current optimization in a hard drive assembly, so as to reduce the effects of adjacent track erasure and poor writing performance in low temperature environments.
2. Description of the Related Art
Disk drives are magnetic recording devices used for the storage of information. The information is typically recorded on concentric tracks on either surface of one or more magnetic recording disks. The disks are rotatably mounted to a spin motor and information is accessed by means of read/write heads that are mounted to actuator arms which are rotated by a voice coil motor. The voice coil motor is excited with a current to rotate the actuator and move the heads. The read/write heads must be accurately aligned with the storage tracks on the disk to ensure proper reading and writing of information. The read/write heads read recorded information from the surface of the disk by sensing the magnetic transitions emanating from the surface of the disk.
To write on a data track, current is applied to the head. The current generates a magnetic field, which magnetizes the surface of the disk. Recording density may be increased by reducing the head/disk distance. This may be accomplished by reducing the size of the read/write heads and to position the heads as near to the disk as possible. However, as magnetic recording heads become smaller in physical dimensions, the amount of write current applied to the head may result in erasing data located on adjacent tracks. This is of concern when the write current that is applied is too high. On the other hand, poor writing performance occurs, especially in low temperature environments, when the write current is not sufficient.
Accordingly, there is a need in the technology for a method and apparatus for providing write current optimization in a disk in a hard drive assembly while overcoming the aforementioned problems.
BRIEF SUMMARY OF THE INVENTION
The present invention is a method and system to optimize a write channel in a hard disk drive. The method comprises providing a disk having a at least one side with a plurality of tracks, and selecting a target track from the plurality of tracks. Data is written at least once on a predetermined plurality of tracks adjacent to either side of the target track and on the target track. Data is also written a predetermined number of times on tracks immediately adjacent to the target track. Data written on the predetermined plurality of tracks adjacent to either side of the target track and on the target track is then read. The process then determines if a number of errors on the tracks is greater than a predetermined criteria, if so, a write current value of the write channel is decreased, otherwise the write current value is increased.


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