JPS6435624A - System for managing free area of disk - Google Patents

System for managing free area of disk

Info

Publication number
JPS6435624A
JPS6435624A JP19004887A JP19004887A JPS6435624A JP S6435624 A JPS6435624 A JP S6435624A JP 19004887 A JP19004887 A JP 19004887A JP 19004887 A JP19004887 A JP 19004887A JP S6435624 A JPS6435624 A JP S6435624A
Authority
JP
Japan
Prior art keywords
free area
size
cluster
area
request
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
JP19004887A
Other languages
Japanese (ja)
Inventor
Yukio Nakano
Shizuo Yokohata
Yuzuru Maya
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 JP19004887A priority Critical patent/JPS6435624A/en
Publication of JPS6435624A publication Critical patent/JPS6435624A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To execute a search processing of a free area at high speed, and to efficiently manage the free area by executing a search by a sector unit, in case of obtaining the free area of a size which is not (n) times of a cluster size. CONSTITUTION:A floppy disk 1-1 is divided into an area 1-2 managed by a sector unit and an area 1-3 managed by a cluster unit, and a sector management table 1-4 and a cluster management table 1-5 are provided on the leading of each area. In this state, when a free area obtaining request is generated, whether the request size is the same size as (n) times of a cluster or not is checked, and when said request size is the same as (n) times of the cluster size, the free area is searched from in the table 1-5, and when it is found out, the corresponding bit is set to '1'. On the other hand, when said request size is different from (n) times of the cluster size, the free area of a request size portion is searched from the table 1-4, and when it is found out, the corresponding bit is set to '1'. In such a way, the search processing of the area can be executed at higher speed than the case when it is executed by only the cluster unit, and the free area can be managed efficiently.
JP19004887A 1987-07-31 1987-07-31 System for managing free area of disk Pending JPS6435624A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19004887A JPS6435624A (en) 1987-07-31 1987-07-31 System for managing free area of disk

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19004887A JPS6435624A (en) 1987-07-31 1987-07-31 System for managing free area of disk

Publications (1)

Publication Number Publication Date
JPS6435624A true JPS6435624A (en) 1989-02-06

Family

ID=16251482

Family Applications (1)

Application Number Title Priority Date Filing Date
JP19004887A Pending JPS6435624A (en) 1987-07-31 1987-07-31 System for managing free area of disk

Country Status (1)

Country Link
JP (1) JPS6435624A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007121086A (en) * 2005-10-27 2007-05-17 Sunx Ltd Detection sensor, mounting tool, and mounting structure for detection sensor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007121086A (en) * 2005-10-27 2007-05-17 Sunx Ltd Detection sensor, mounting tool, and mounting structure for detection sensor

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