JPS55117775A - Magnetic head positioning control circuit of magnetic disk unit - Google Patents
Magnetic head positioning control circuit of magnetic disk unitInfo
- Publication number
- JPS55117775A JPS55117775A JP2137579A JP2137579A JPS55117775A JP S55117775 A JPS55117775 A JP S55117775A JP 2137579 A JP2137579 A JP 2137579A JP 2137579 A JP2137579 A JP 2137579A JP S55117775 A JPS55117775 A JP S55117775A
- Authority
- JP
- Japan
- Prior art keywords
- pulse
- cylinder
- counter
- value
- subtraction
- 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.)
- Pending
Links
Landscapes
- Moving Of Head For Track Selection And Changing (AREA)
- Control Of Position Or Direction (AREA)
Abstract
PURPOSE: To realize versatility and high integration while simplifying a maintenance diagnosis, by freely modifying a reference speed profile by storing the value of a constant-speed area and that of a function-speed area in subtraction counters respectively.
CONSTITUTION: Function speed value Y is stored in subtraction counter 12 via bus 1 by tag 2, and cylinder-number X in a constant-speed area in subtraction counter 11 via bus 1 by tag 3, so that a signal corresponding to value Y will appear at output 5 of function generator 13. Once driver circuit 15 receives seek start signal 8 in this state, positioning mechanism 17 starts moving so as to obtain pulse 7 every time a magnetic head passed through a cylinder and when counter 11 is subtracted by pulse 7 down to zero, borrow signal 6 is outputted corresponding to pulse 7. After mechanism 17 passes through cylinder as many as number X, pulse 7 puts counter 12 in subtraction operation and when its count value is zero, reference speed signal 5 shows zero, so that the head will stop at an aimed cylinder position.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2137579A JPS55117775A (en) | 1979-02-27 | 1979-02-27 | Magnetic head positioning control circuit of magnetic disk unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2137579A JPS55117775A (en) | 1979-02-27 | 1979-02-27 | Magnetic head positioning control circuit of magnetic disk unit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55117775A true JPS55117775A (en) | 1980-09-10 |
Family
ID=12053340
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2137579A Pending JPS55117775A (en) | 1979-02-27 | 1979-02-27 | Magnetic head positioning control circuit of magnetic disk unit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55117775A (en) |
-
1979
- 1979-02-27 JP JP2137579A patent/JPS55117775A/en active Pending
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