Issued Patents All Time
Showing 1–15 of 15 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7855850 | Method and apparatus for head positioning using spiral servo patterns in a disk drive | Toshitaka Matsunaga, Masahide Yatsu, Hideo Sado, Katsuki Ueda, Shouji Nakajima +1 more | 2010-12-21 |
| 7852593 | Method and apparatus for writing servo data, using spiral servo patterns in a disk drive | Hideo Sado, Toshitaka Matsunaga, Shouji Nakajima, Katsuki Ueda | 2010-12-14 |
| 7804659 | Method and apparatus for positioning head using spiral servo pattern in a disk drive | Toshitaka Matsunaga, Masahide Yatsu, Hideo Sado, Katsuki Ueda, Shouji Nakajima +1 more | 2010-09-28 |
| 7710682 | Method and apparatus for writing spiral servo pattern in a disk drive | Masahide Yatsu, Hideo Sado, Katsuki Ueda, Toshitaka Matsunaga, Shinichirou Kouhara +1 more | 2010-05-04 |
| 7675705 | Method and apparatus for writing servo pattern using spiral pattern in disk drive | Masahide Yatsu, Hideo Sado, Katsuki Ueda, Toshitaka Matsunaga, Shinichirou Kouhara +1 more | 2010-03-09 |
| 7639446 | Disk drive device and servo write method | Hideo Sado, Toshitaka Matsunaga, Shouji Nakajima | 2009-12-29 |
| 7639445 | Disk drive device and head positioning control method | Toshitaka Matsunaga, Hideo Sado, Shouji Nakajima, Katsuki Ueda, Shinichirou Kouhara | 2009-12-29 |
| 7630161 | Method and apparatus for writing spiral servo pattern in a disk drive | Shouji Nakajima, Masahide Yatsu, Hideo Sado, Katsuki Ueda, Toshitaka Matsunaga +1 more | 2009-12-08 |
| 7538965 | Method and apparatus for writing servo management information in a disk drive | Katsuki Ueda, Yuichi Notake, Masahide Yatsu, Hideo Sado, Takuji Shimada +1 more | 2009-05-26 |
| 7477472 | Method and apparatus for writing servo data in a disk drive using spiral servo patterns | Hideo Sado, Masahide Yatsu, Katsuki Ueda, Toshitaka Matsunaga, Shouji Nakajima +1 more | 2009-01-13 |
| 7457074 | Method and apparatus for correcting errors while writing spiral servo information in a disk drive | Hideo Sado, Masahide Yatsu, Yuichi Notake, Takayuki Matsuzaki, Takuji Shimada | 2008-11-25 |
| 7423835 | Method and apparatus for servo control using spiral servo information in a disk drive | Hideo Sado, Masahide Yatsu, Masafumi Iwashiro, Shouji Nakajima, Shinichiro Kouhara | 2008-09-09 |
| 7173789 | Head position calculation method in magnetic disc apparatus | Shinichirou Kouhara, Masahide Yatsu, Masafumi Iwashiro, Hideo Sado | 2007-02-06 |
| 7023648 | Method and apparatus for writing servo data in a disk drive | — | 2006-04-04 |
| 6779081 | Apparatus and method for defragmentation in disk storage system | Yutaka Arakawa | 2004-08-17 |