| Patent Number |
Title Of Patent |
Date Issued |
| 4882639 |
Changeover writing circuit for magnetic disk apparatus operable at plural densities |
November 21, 1989 |
| A magnetic recording and reproducing apparatus which can write magnetic information in different recording periods so that information stored in a magnetic medium can be modified or corrected therewith in whichever recording period it is recorded. The apparatus comprises a bias chang |
| 4805047 |
Read/write magnetic disk apparatus operable in plural density modes |
February 14, 1989 |
| A magnetic recording and reproducing apparatus wherein mechanical deteriorations and induced noises can be eliminated and detection signals different in recording density can be read by a reading circuit without a misoperation. The apparatus comprises a filter circuit including a swi |
| 4555738 |
Head adjusting disk |
November 26, 1985 |
| An improved head adjusting disk is disclosed which is adapted to be used for adjustment of the position of a head in a mechanism such as a floppy disk drive mechanism. On the improved head adjusting disk, two head position adjusting record tracks for adjustment of the position of a head |
