Source: http://www.google.com/patents/US7134051?ie=ISO-8859-1&dq=5463388
Timestamp: 2015-05-29 01:20:54
Document Index: 353124391

Matched Legal Cases: ['art 8', 'art 14', 'art 13', 'art 15', 'art 16', 'art 17', 'art 15']

Patent US7134051 - Disk memory device, disk memory device defect detecting method, and program ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA disk memory device is provided that measures a time for reading or writing a prescribed amount of data with an access time measurement part, compares access time data with a previously set limit time with an access time defect determining part, and, when the access time data exceeds the limit time,...http://www.google.com/patents/US7134051?utm_source=gb-gplus-sharePatent US7134051 - Disk memory device, disk memory device defect detecting method, and program recording mediumAdvanced Patent SearchPublication numberUS7134051 B2Publication typeGrantApplication numberUS 10/332,618PCT numberPCT/JP2002/004560Publication dateNov 7, 2006Filing dateMay 10, 2002Priority dateMay 11, 2001Fee statusPaidAlso published asCN1462447A, CN100505068C, US20030149918, WO2002101744A1Publication number10332618, 332618, PCT/2002/4560, PCT/JP/2/004560, PCT/JP/2/04560, PCT/JP/2002/004560, PCT/JP/2002/04560, PCT/JP2/004560, PCT/JP2/04560, PCT/JP2002/004560, PCT/JP2002/04560, PCT/JP2002004560, PCT/JP200204560, PCT/JP2004560, PCT/JP204560, US 7134051 B2, US 7134051B2, US-B2-7134051, US7134051 B2, US7134051B2InventorsNoriaki TakaichiOriginal AssigneeMatsushita Electric Industrial Co., Ltd.Export CitationBiBTeX, EndNote, RefManPatent Citations (17), Referenced by (2), Classifications (16), Legal Events (7) External Links: USPTO, USPTO Assignment, EspacenetDisk memory device, disk memory device defect detecting method, and program recording medium
US 7134051 B2Abstract
A disk memory device is provided that measures a time for reading or writing a prescribed amount of data with an access time measurement part, compares access time data with a previously set limit time with an access time defect determining part, and, when the access time data exceeds the limit time, determines that a corresponding area on a disk memory (4) is defective, and enters the area into a defect list so that the corresponding area is not used. Thereby, when the disk memory device is used for recording/reproducing AV data, data access is performed within a prescribed time, so that videos are reproduced without interruption or data is recorded without lack of frame.
The present invention relates to a disk memory device for recording or reading data on/from a disk memory medium such as a magnetic disk or a magneto-optical disc and, more particularly, to a method for determining a defect of the disk memory device, which includes a determination of a defect position on the disk memory medium.
In a disk memory device, in a case where a deficiency due to a flaw or the like exists on a disk memory medium on which data are recorded, when the data written in a sector including the deficiency portion is read, a read error sometimes occurs. Further, when the deficiency portion exists in a servo signal part on the disk memory medium, which part has previously been recorded for positioning a head structure, the deficiency portion adversely affects the accuracy of the head structure positioning and, thus, a position of a target sector from/into which data is to be read or written can not be specified. In this case, a read error or a write error for the target sector sometimes occurs.
According to a first aspect of the present invention, there is provided a disk memory device comprising: an access time measurement part for measuring a time for reading or writing a prescribed amount of data; a limit time setting part for setting limit times for reading and writing the prescribed amount of data; an access time defect determining part for comparing the measured access time with the set limit time to determine a defect in an accessed area according to whether the access time is longer than the limit time or not; and a defect entry part for entering a position of an area which is determined as defective by the access time defect determining part, into a defect list, as a defective area position.
Next, a second embodiment of the present invention will be described with reference to FIGS. 3 to 7.
As described above, according to the third embodiment, the disk memory device 100 b is provided with the access time measurement part 8 for measuring a time for reading or writing a prescribed amount of data, the access time data storage part 14 for storing the measured access time as the access time data 19, the reference time data storage part 13 for storing the access time which is measured for the whole access area at manufacture of the disk memory device, as the reference time data 18, the disk memory defect determining part 15 for comparing the access time data 19 with the reference time data 18 to determine the existence of defective area in the disk memory 4 or performance degradation thereof, thereby determining a defect of the disk memory device 100 b, and the disk memory defect warning part 16 for notifying the host device 1 or the display part 17 of the defect of the disk memory device 100 b when it is judged that the disk memory device 100 b is defective from the result of the determination by the disk memory defect determining part 15. Therefore, by detecting performance degradation after manufacture of the disk memory device and notifying the host device 1 or a user of the degradation, it is possible to take a measure such as saving data in the disk memory device 100 b into another recording medium, or exchanging the disk memory device 100 b. APPLICABILITY IN INDUSTRY
A disk memory device, a disk memory device defect determining method, and a recording medium storing a program that enables a computer to execute the method according to the present invention are extremely useful for reproducing video without interruption or recording pictures without lack of frame when the disk memory device is employed for recording/reproducing AV data.
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS5157666 *Sep 24, 1990Oct 20, 1992Xerox CorporationDisk timing diagnosticUS5388254 *Mar 27, 1992Feb 7, 1995International Business Machines CorporationMethod and means for limiting duration of input/output (I/O) requestsUS5812752 *Jul 10, 1996Sep 22, 1998International Business Machines CorporationMethod and apparatus for error recovery in a disk driveUS6115544 *Oct 6, 1994Sep 5, 2000International Business Machines CorporationMethod and system for displaying error messagesUS6182022 *Jan 26, 1998Jan 30, 2001Hewlett-Packard CompanyAutomated adaptive baselining and thresholding method and systemUS6393580Aug 2, 2000May 21, 2002Hitachi, Ltd.Automatic read reassignment method and a magnetic disk driveUS6625755 *Nov 10, 1999Sep 23, 2003Hitachi Software Engineering Co., Ltd.Storage apparatus and control method thereofUS6738924 *Jan 14, 2000May 18, 2004Seagate Tech. LlcFull slip defect management system using track identificationUS6918054 *Apr 25, 2003Jul 12, 2005Hitachi, Ltd.Storage apparatus and control method thereofJP2000100086A Title not availableJP2001297541A Title not availableJPH1027437A Title not availableJPH1186454A Title not availableJPH06111460A Title not availableJPH08305502A * Title not availableKR19980075473A Title not availableWO1999039347A1Feb 2, 1998Aug 5, 1999Masutaka HaradaAutomatic replacing method in reading and magnetic disc drive using the method* Cited by examinerReferenced byCiting PatentFiling datePublication dateApplicantTitleUS7570558 *Sep 2, 2005Aug 4, 2009Via Technologies, Inc.Disc playing method without interruption and system thereofUS7800992 *Apr 23, 2007Sep 21, 2010Mediatek Inc.Optical disc drive and method thereof* Cited by examinerClassifications U.S. Classification714/42, 714/48, G9B/27.052, G9B/20.046, 714/55International ClassificationG06F3/06, G11B27/36, G06F11/00, G11B20/18, G11B20/12, H04N5/781, G11B20/10Cooperative ClassificationG11B20/18, G11B27/36European ClassificationG11B20/18, G11B27/36Legal EventsDateCodeEventDescriptionDec 16, 2014ASAssignmentOwner name: WESTERN DIGITAL TECHNOLOGIES, INC., CALIFORNIAFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:PANASONIC CORPORATION;REEL/FRAME:034650/0885Effective date: 20141015Apr 9, 2014FPAYFee paymentYear of fee payment: 8Mar 19, 2014ASAssignmentOwner name: PANASONIC CORPORATION, JAPANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:PANASONIC HEALTHCARE CO., LTD.;REEL/FRAME:032480/0433Effective date: 20140301Feb 27, 2014ASAssignmentOwner name: PANASONIC HEALTHCARE CO., LTD., JAPANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:PANASONIC CORPORATION;REEL/FRAME:032360/0795Effective date: 20131127Feb 25, 2014ASAssignmentOwner name: PANASONIC CORPORATION, JAPANFree format text: CHANGE OF NAME;ASSIGNOR:MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.;REEL/FRAME:032332/0082Effective date: 20081001Apr 29, 2010FPAYFee paymentYear of fee payment: 4Jan 10, 2003ASAssignmentOwner name: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD., JAPANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:TAKAICHI, HORIAKI;REEL/FRAME:013996/0786Effective date: 20021210RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services