JPS6470961A - System for controlling hard disk device - Google Patents
System for controlling hard disk deviceInfo
- Publication number
- JPS6470961A JPS6470961A JP22765887A JP22765887A JPS6470961A JP S6470961 A JPS6470961 A JP S6470961A JP 22765887 A JP22765887 A JP 22765887A JP 22765887 A JP22765887 A JP 22765887A JP S6470961 A JPS6470961 A JP S6470961A
- Authority
- JP
- Japan
- Prior art keywords
- flag
- area
- accessed
- defective part
- access
- 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
Abstract
PURPOSE:To shorten an access time by reading a flag to display the existence and position of a defective part from a magnetic disk device and preventing checking whether an access area is the defective part or not when the flag is off. CONSTITUTION:Before magnetic disk devices 41-4n are accessed, all flags F are read, a flag table 9 is prepared by a flag table preparing circuit 8, and the table is stored in a main storage device 2. When the devices 41-4n are accessed, the flag F corresponding to the accessed area is supplied from the flag table 9 in the device 2 to a flag confirming circuit 7. When the flag is off, a control circuit 5 considers that the defective part does not exist in the area, accesses the area, executes a reading or a writing, and does not check whether the access area is the defective area or not. On the other hand, when the flag is on, before the access, home address defect information SD and the address of the area to be accessed are compared, and whether the area is the defective part or not is checked.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP22765887A JPS6470961A (en) | 1987-09-11 | 1987-09-11 | System for controlling hard disk device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP22765887A JPS6470961A (en) | 1987-09-11 | 1987-09-11 | System for controlling hard disk device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6470961A true JPS6470961A (en) | 1989-03-16 |
Family
ID=16864311
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP22765887A Pending JPS6470961A (en) | 1987-09-11 | 1987-09-11 | System for controlling hard disk device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6470961A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0926859A (en) * | 1995-07-10 | 1997-01-28 | Nec Corp | Disk volume duplex system |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62248171A (en) * | 1986-04-22 | 1987-10-29 | Nec Corp | Errored track substituting method for magnetic disk |
-
1987
- 1987-09-11 JP JP22765887A patent/JPS6470961A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62248171A (en) * | 1986-04-22 | 1987-10-29 | Nec Corp | Errored track substituting method for magnetic disk |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0926859A (en) * | 1995-07-10 | 1997-01-28 | Nec Corp | Disk volume duplex system |
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