Company Filing History:

9 out of 42,485

Hitachi, Ltd.

patents

2 out of 227

Hitachi Global Storage Technologies Japan, Ltd.

patents

Years Active: 1991-2006

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11 patents (USPTO):Sort by Forward Citations

Abstract keywords

1. 7154688 - Disk device having a function to confirm that a selected head is proper for a disk surface (2006-12-26),

2. 6989957 - Disk storage device (2006-01-24),

3. 6864656 - Magnetic disk drive and voice coil motor drive circuit (2005-03-08),

4. 6738218 - Disk storage device and head positioning method (2004-05-18),

5. 6611118 - Magnetic disk drive and voice coil motor drive circuit (2003-08-26),

6. 6407876 - Magnetic disk apparatus having an accelerometer for detecting acceleration in the positioning direction of the magnetic head (2002-06-18),

7. 6335845 - Magnetic disk apparatus having an accelerometer for detecting acceleration in the positioning direction of the magnetic head (2002-01-01),

8. 6130797 - Magnetic recorder and magnetooptical recorder (2000-10-10),

9. 5986845 - Apparatus for positioning magnetic head and method of the same (1999-11-16),

10. 5402400 - Method and apparatus for eliminating external disturbances in a disk (1995-03-28),

11. 5073912 - Sample moving apparatus, sample moving system and semiconductor (1991-12-17),

Title: Yosuke Hamada: Innovator in Disk Technology

Introduction

Yosuke Hamada is a prominent inventor based in Odawara, Japan, known for his significant contributions to disk technology. With a total of 11 patents to his name, he has made remarkable advancements in the field of data storage and retrieval.

Latest Patents

Hamada's latest patents include a disk device that features a function to confirm that a selected head is appropriate for a disk surface. This invention aims to prevent data loss caused by incorrect head selection, thereby enhancing the reliability of information recording and reproduction. The device utilizes a SAM pattern in the servo information region, which is altered for each head and recorded. By reading the SAM pattern, the device can determine which head accesses the disk surface and perform an error check. Additionally, he has developed a disk storage device that includes a controller for calculating drive signals to position the head accurately on the desired track. This device employs both current and voltage feedback amplifiers to ensure optimal performance under varying conditions.

Career Highlights

Throughout his career, Yosuke Hamada has worked with notable companies such as Hitachi, Ltd. and Hitachi Global Storage Technologies Japan, Ltd. His experience in these organizations has contributed to his expertise in disk technology and innovation.

Collaborations

Hamada has collaborated with esteemed colleagues, including Katsumoto Onoyama and Takashi Yamaguchi, further enhancing his work in the field.

Conclusion

Yosuke Hamada's innovative contributions to disk technology have significantly impacted data storage solutions. His patents reflect a commitment to improving reliability and efficiency in information management.

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