Information storage device

• US 20030200384A1
• Filed: 12/16/2002
• Published: 10/23/2003
• Est. Priority Date: 04/23/2002
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Edanami, Hiroyuki
• Granted Patent: US 7,149,822 B2
• Time in Patent Office: Days
• US Class Current: 711/112
• CPC Class Codes: G06F 12/0238 Memory management in non-volatile memory, e.g. resistive RAM or ferroelectric memory
• CPC Class Codes: G06F 2003/0697 device management, e.g. handlers, drivers, I/O schedulers
• CPC Class Codes: G06F 3/0601 Interfaces specially adapted for storage systems
• CPC Class Codes: G06F 3/0613 in relation to throughput
• CPC Class Codes: G06F 3/0643 Management of files
• CPC Class Codes: G06F 3/0677 Optical disk device, e.g. CD-ROM, DVD
• CPC Class Codes: G11B 2220/20 Disc-shaped record carriers
• CPC Class Codes: G11B 2220/41 Flat as opposed to hierarchical combination, e.g. library of tapes or discs, CD changer, or groups of record carriers that together store one title
• CPC Class Codes: G11B 27/11 by using information not detectable on the record carrier
• CPC Class Codes: G11B 27/329 on a disc [VTOC]

Abstract

To improve a throughput of information storage devices by reducing the number of discontiguous information files, in an MO drive, a CPU operates in accordance with a program stored in a program storage circuit to determine whether ,transmission of instructions from a host is intermitted and, if the transmission is intermitted, the CPU rearranges information files discontiguously stored on an MO disk.

Claims

1. An information storage device that at least performs a write of an information file onto a recording medium in accordance with an instruction sent from a higher-level device, comprising:

a determination section that determines whether transmission of instructions from said higher-level device is intermitted; and

a component rearrangement section that rearranges components of an information file to transform the information file whose components are discontiguously stored on said recording medium into an information file whose components are stored contiguously, if said determination section determines that transmission of instructions is intermitted.

2. The information storage device according to claim 1, wherein said recording medium is a recording medium selected from a group consisting of a plurality of types of recording media;

and said information storage device further comprises a file rearrangement section that rearranges a plurality of information files recorded on said recording medium in an order according to the type of said recording medium.

3. The information storage device according to claim 1, wherein said recording medium is a magneto-optical recording medium.

4. The information storage device according to claim 1, further comprising:

a first switch that turns on and/or off a power supply in response to an operation;

a second switch provided in parallel with said first switch that turns on and/or off the power supply in response to a control signal; and

a switch controller that suspends rearrangement at a time when a read or write performed on an information file subject to the rearrangement is ensured and then providing a control signal that turns off said second switch to said second switch if said first switch is turned off in response to a user operation during the rearrangement performed by said component rearrangement section.

5. The information storage device according to claim 2, comprising:

a first switch that turns on and/or off a power supply in response to an operation;

a second switch provided in parallel with said first switch that turns on and/or off the power supply in response to a control signal; and

a switch controller that suspends rearrangement at a time when a read or write performed on an information file subject to the rearrangement is ensured and then providing a control signal that turns off said second switch to said second switch if said first switch is turned off in response to a user operation during the rearrangement performed by said file rearrangement section.