JPS6462868A - Magnetic disk device - Google Patents
Magnetic disk deviceInfo
- Publication number
- JPS6462868A JPS6462868A JP21947387A JP21947387A JPS6462868A JP S6462868 A JPS6462868 A JP S6462868A JP 21947387 A JP21947387 A JP 21947387A JP 21947387 A JP21947387 A JP 21947387A JP S6462868 A JPS6462868 A JP S6462868A
- Authority
- JP
- Japan
- Prior art keywords
- head address
- decoding
- circuit
- magnetic disk
- latch circuit
- 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
- Signal Processing For Digital Recording And Reproducing (AREA)
- Indexing, Searching, Synchronizing, And The Amount Of Synchronization Travel Of Record Carriers (AREA)
Abstract
PURPOSE:To easily prevent the reading of information stored in the arbitrary position of a magnetic disk medium in a magnetic disk drive by everybody, by equipping a decoding circuit to change a logical head address to a physical head address. CONSTITUTION:A data bus (a) to send respective types of data is connected to a latch circuit 1 and a latch circuit 2. The information sent to select the rule to change the logical head address to the physical head address is mounted to a data bus (a), a decoding parameter writing signal (b) is made active, and thus, the information is held at a latch circuit 1 and outputted to a decoding circuit 3 as a decoding parameter (e). The information sent to select a certain head is mounted, by making active a head address writing signal (c), held at a latch circuit 2, and outputted to the decoding circuit 3 as a logical head address (f). The decoding parameter (e) and the logical head address (f) become the address of a memory circuit 4 of the decoding circuit 3, and when a decoding enable signal (d) is made active, a physical head address (g) is sent.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21947387A JPS6462868A (en) | 1987-09-01 | 1987-09-01 | Magnetic disk device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21947387A JPS6462868A (en) | 1987-09-01 | 1987-09-01 | Magnetic disk device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6462868A true JPS6462868A (en) | 1989-03-09 |
Family
ID=16735981
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP21947387A Pending JPS6462868A (en) | 1987-09-01 | 1987-09-01 | Magnetic disk device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6462868A (en) |
-
1987
- 1987-09-01 JP JP21947387A patent/JPS6462868A/en active Pending
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