Information storage device having internal defragmentation capability

• US 7,149,822 B2
• Filed: 12/16/2002
• Issued: 12/12/2006
• Est. Priority Date: 04/23/2002
• Status: Expired due to Fees

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Edanami, Hiroyuki
• Primary Examiner(s): Fleming, Fritz
• Assistant Examiner(s): Schneider, Joshua D
• Application Number:
  US10/320,570
• Publication Number:
  US 20030200384A1
• Time in Patent Office: 1,457 Days
• Field of Search: 709/100, 711/170, 711/213, 710/5, 710/33, 710/6, 710/8, 710/14, 710/15, 710/18, 710/89, 710/58, 710/59, 348/156
• US Class Current: 710/18
• 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 the storage device is in an idle state;

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 the storage device is in said idle state;

wherein transformation is conducted independent of the higher-level device so that the higher-level device is capable of executing some processing during continuing transformation;

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 of the components at a time when a read or write performed on an information file subject to the rearrangement occurs, and then provides a control signal to said second switch that maintains said second switch turned on until completion of said write performed on said information file subject to the rearrangement if said first switch is turned off in response to said operation occurring prior to said completion of said write performed on said information file subject to the rearrangement.

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, wherein said recording medium is a recording medium selected from a group consisting of a plurality of types of recording media and a recording area thereof is divided into a plurality of zones;

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 so as to lower a possibility of the information files being extended across said zones.