JPS58112153A - Magnetic disk controller - Google Patents

Magnetic disk controller

Info

Publication number
JPS58112153A
JPS58112153A JP20921181A JP20921181A JPS58112153A JP S58112153 A JPS58112153 A JP S58112153A JP 20921181 A JP20921181 A JP 20921181A JP 20921181 A JP20921181 A JP 20921181A JP S58112153 A JPS58112153 A JP S58112153A
Authority
JP
Japan
Prior art keywords
sector
address
defective
counter
magnetic disk
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
Application number
JP20921181A
Other languages
Japanese (ja)
Inventor
Yoshiaki Yamashita
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP20921181A priority Critical patent/JPS58112153A/en
Publication of JPS58112153A publication Critical patent/JPS58112153A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To ensure a sector process with high efficiency, by executing the retrieval for a substitute sector with the address information at a home address part of a defective sector when the coincidence is obtained between the contents of a counter and a sector address designated by a program in case a defective sector is detected.
CONSTITUTION: A sector designated by a program is retrieved by comparing the contents of a cylinder address register 41, a head address register 42 and a sector address register 43 with a data 45 read out of a driving device through a comparator 46. In this case, a counter 48 is provided to know a defective sector address. The counter 48 is reset by an index pulse 49 given from a magnetic disk driving device and counted up by a sector pulse 50. Thus a sector address is obtained. If the defective sector is not identical with the desired one, no coincidence signal is delivered from a comparator 52. As a result, no defective sector detecting signal is delivered. Therefore no process is carried out for the substitute sector, and the desired sector is retrieved continuously at and after the next sector.
COPYRIGHT: (C)1983,JPO&Japio
JP20921181A 1981-12-25 1981-12-25 Magnetic disk controller Pending JPS58112153A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20921181A JPS58112153A (en) 1981-12-25 1981-12-25 Magnetic disk controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20921181A JPS58112153A (en) 1981-12-25 1981-12-25 Magnetic disk controller

Publications (1)

Publication Number Publication Date
JPS58112153A true JPS58112153A (en) 1983-07-04

Family

ID=16569185

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20921181A Pending JPS58112153A (en) 1981-12-25 1981-12-25 Magnetic disk controller

Country Status (1)

Country Link
JP (1) JPS58112153A (en)

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