Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the record
Patent
1992-02-28
1995-02-07
Look, Edward K.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the record
360 723, G11B 1518
Patent
active
053880161
ABSTRACT:
A magnetic tape data management method and apparatus is described that reduces the access time for updating and referring to directory data. At the time of accessing data on a magnetic tape loaded in a magnetic tape subsystem, directory data for the magnetic tape is, in response to the completion of the processing of data, recorded in a region located near the place at which the magnetic tape head is positioned at that time, said region constituting a directory data region (DDR). Further, a directory data memory for recording directory data from the magnetic tape is provided in the magnetic tape subsystem, remote from the tape. At the time of accessing data on the magnetic tape loaded in the magnetic tape subsystem, directory data for the magnetic tape processing is, in response to completion of the processing of data, recorded in the directory data memory in the magnetic tape subsystem.
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Tada and Fushiki: "Format for using DAT for recording code data, a proposal made jointly by Sony and Hewlett-Packard", Nikkei Electronics, Mar. 7, 1988, No. 442, pp. 145-148.
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Kakuse Katsuharu
Kanai Sadasaburoh
Kitajima Hiroyuki
Kosuge Minoru
Nishimura Toshifumi
Hitachi , Ltd.
Look Edward K.
Verdier Christopher
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