JPS6462868A - Magnetic disk device - Google Patents

Magnetic disk device

Info

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
Application number
JP21947387A
Other languages
Japanese (ja)
Inventor
Koichi Ishihara
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.)
NEC Corp
Original Assignee
NEC Corp
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 NEC Corp filed Critical NEC Corp
Priority to JP21947387A priority Critical patent/JPS6462868A/en
Publication of JPS6462868A publication Critical patent/JPS6462868A/en
Pending legal-status Critical Current

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.
JP21947387A 1987-09-01 1987-09-01 Magnetic disk device Pending JPS6462868A (en)

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)

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