JPS6421773A - Magnetic disk device - Google Patents
Magnetic disk deviceInfo
- Publication number
- JPS6421773A JPS6421773A JP17764387A JP17764387A JPS6421773A JP S6421773 A JPS6421773 A JP S6421773A JP 17764387 A JP17764387 A JP 17764387A JP 17764387 A JP17764387 A JP 17764387A JP S6421773 A JPS6421773 A JP S6421773A
- Authority
- JP
- Japan
- Prior art keywords
- servo
- voltage
- amplitude
- reference voltage
- comparator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Moving Of The Head To Find And Align With The Track (AREA)
Abstract
PURPOSE:To shorten a servo area, and to increase the storage capacity of a disk by allowing the reference voltage of a comparator to generate a servo ID detection signal be always a voltage value that the minimum voltage and the maximum voltage of a comparator input voltage are divided by a definite ratio, by using a reference voltage output circuit. CONSTITUTION:The reference voltage output circuit 5 outputs the voltage value that an interval between the minimum voltage and the maximum voltage of a detection output is divided by the some definite ratio. The comparator 6 compares the output of the reference voltage output circuit 5 with the detection output 4', and generates a pulse 6' as the servo ID detection signal. A position error detector 7 detects the amplitude of a reproduced signal 2a', and at the same time, when the pulse of the servo ID detection signal is inputted, the detector 7 reads out the amplitude of the reproduced signal definite time after that, and outputs a position error signal, proportional to the difference of the amplitude of a servo data part. Thus, the servo area, necessitated for exactly detecting the amplitude of the servo data part and correctly controlling the position of the magnetic head, can be shortened, and the storage capacity of the magnetic disk can be increased.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17764387A JPH0668894B2 (en) | 1987-07-15 | 1987-07-15 | Magnetic disk unit |
DE3851684T DE3851684T2 (en) | 1987-07-15 | 1988-07-15 | Control of the relative position of a magnetic head and a recording medium. |
US07/219,545 US5053899A (en) | 1987-07-15 | 1988-07-15 | Exact position control of a relative position between a magnetic head and a recording medium |
EP88111412A EP0314879B1 (en) | 1987-07-15 | 1988-07-15 | Control of relative position between a magnetic head and a recording medium |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17764387A JPH0668894B2 (en) | 1987-07-15 | 1987-07-15 | Magnetic disk unit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6421773A true JPS6421773A (en) | 1989-01-25 |
JPH0668894B2 JPH0668894B2 (en) | 1994-08-31 |
Family
ID=16034578
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP17764387A Expired - Fee Related JPH0668894B2 (en) | 1987-07-15 | 1987-07-15 | Magnetic disk unit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0668894B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5581418A (en) * | 1994-03-15 | 1996-12-03 | Fujitsu Limited | Magnetic disk drive unit capable of determining data region position of data region that does not include position identification data |
-
1987
- 1987-07-15 JP JP17764387A patent/JPH0668894B2/en not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5581418A (en) * | 1994-03-15 | 1996-12-03 | Fujitsu Limited | Magnetic disk drive unit capable of determining data region position of data region that does not include position identification data |
Also Published As
Publication number | Publication date |
---|---|
JPH0668894B2 (en) | 1994-08-31 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |