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Researchers Submit Patent Application, "Recording/Reproducing Device and Optical Disk Library Device", for Approval

August 19, 2014



By a News Reporter-Staff News Editor at Information Technology Newsweekly -- From Washington, D.C., VerticalNews journalists report that a patent application by the inventors OKAMOTO, Tomomi (Tokyo, JP); FUJITA, Shinji (Tokyo, JP); YASUKAWA, Takakiyo (Tokyo, JP); KOBAYASHI, Masayuki (Tokyo, JP), filed on January 15, 2014, was made available online on August 7, 2014.

The patent's assignee is Hitachi-LG Data Storage, Inc.

News editors obtained the following quote from the background information supplied by the inventors: "The present invention relates to a recording/reproducing device that uses an optical disk or an optical disk library device that uses the recording/reproducing device, and especially relates to shortening of a processing time at the time of recording on the optical disk.

"In the recording/reproducing device which records and reproduces data on the optical disk, there is a case where verify processing and compare processing are performed in order to secure reliability of recorded data. The verify processing is processing of inspecting a quality of the recorded data, and the compare processing is processing of inspecting whether the data recorded on the optical disk can be read without errors. The verify processing and the compare processing are described in Japanese Unexamined Patent Application Publication No. 2010-267367 and Japanese Unexamined Patent Application Publication No. 2011-154749."

As a supplement to the background information on this patent application, VerticalNews correspondents also obtained the inventors' summary information for this patent application: "Problems of verify processing and compare processing in the conventional optical disk will be explained using drawings. FIG. 13 and FIG. 14 are diagrams that explain an operation of an optical disk drive having a function of performing the verify processing on recorded data. Upon reception of a command that directs recording from a host controller 2, an optical disk drive 1 records the data transmitted from the host controller 2 on an optical disk. At this time, the optical disk drive 1 checks that the data is correctly recorded by performing write processing 22 in a fixed capacity unit and subsequently performing the verify processing 23 tracing back to the recorded area, not performing processing of writing data on the optical disk (the write processing). Recording such that the data quality is secured can be performed by performing these write processing 22 and verify processing 23 repeatedly. Generally, since in the optical disk drive, the same optical pickup is used to perform the recording and reproduction, it cannot perform the write processing 22 and the verify processing 23 simultaneously, but repeats the write processing 22 and the verify processing 23 alternately, and therefore a comparable time as in the write processing of writing data on the optical disk becomes necessary in the verify processing 23.

"Moreover, operations in the case where the verify processing and the compare processing are performed at the time of recording using the optical disk drive 1 of FIG. 13 will be explained by FIG. 15 and FIG. 16. The compare processing 24 is processing that inspects whether the same data is being able to be reproduced by actually reproducing a portion in which the recording was performed and comparing reproduced data and the data transferred for the recording by the host controller 2. Since it is necessary to reproduce the recorded area in order to perform the compare processing 24, the compare processing 24 will be performed after the write processing 22 and the verify processing 23 are completed. Since it is necessary to reproduce all the recorded areas, a time comparable as the time required in the write processing is needed for the compare processing. Therefore, when the verify processing and the compare processing are performed at the time of recording, about three times the time required for the write processing becomes necessary. For this reason, it had become a problem to shorten a time in recording processing accompanied by the verify processing and the compare processing in the recording/reproducing device that uses the optical disk.

"The above-mentioned problems are addressed by an invention described in 'What is claimed is'.

"For example, a recording quality storage part is provided in the recording/reproducing device, and the recording/reproducing device transmits the reproduced data to the host controller while storing quality information at the time of reproduction in the recording quality storage part by an instruction of the host controller. The host controller performs the compare processing by comparing the transmitted data and the data at the time of recording, moreover acquires the quality information of a reproduced area from the recording/reproducing device at intervals set in advance, and inspects the recording quality.

"According to an aspect of the present invention, a time of the recording processing accompanied by the verify processing and the compare processing can be shortened in the recording/reproducing device that uses the optical disk,

BRIEF DESCRIPTION OF THE DRAWINGS

"FIG. 1 is a diagram for explaining a first embodiment of the present invention, and is a block diagram of an optical disk drive;

"FIG. 2 is a diagram for explaining the first embodiment of the present invention, is a diagram for explaining write processing on the optical disk, compare processing, and verify processing, and is a diagram for explaining that the compare processing and the verify processing are performed by a host controller;

"FIG. 3 is a diagram for explaining the first embodiment of the present invention, and is a diagram for explaining a processing flow of the write processing on the optical disk, the compare processing, and the verify processing;

"FIG. 4 is a diagram for explaining the first embodiment of the present invention, is a diagram for explaining the write processing on the optical disk, the compare processing, and the verify processing, and is a diagram for explaining a timing at which the write processing, the compare processing, and the verify processing are performed and their processing times;

"FIG. 5 is a diagram for explaining the first embodiment of the present invention, and is a diagram for explaining the processing flow of the write processing on the optical disk, the compare processing, and the verify processing;

"FIG. 6 is a diagram for explaining a second embodiment of the present invention, and is a block diagram of an optical disk drive;

"FIG. 7 is a diagram for explaining the second embodiment of the present invention, is a diagram for explaining the write processing on the optical disk, the compare processing, and the verify processing, and is a diagram for explaining that the compare processing is performed by the host controller and the verify processing is performed by the optical disk drive;

"FIG. 8 is a diagram for explaining a third embodiment of the present invention, is a diagram for explaining the write processing, the compare processing, and the verify processing in an optical disk library that houses and uses multiple optical disks, and is a diagram for explaining that the compare processing and the verify processing are performed by the host controller;

"FIG. 9 is a diagram for explaining a fourth embodiment of the present invention, is a diagram for explaining the write processing, the compare processing, and the verify processing in the optical disk library that houses and uses the multiple optical disks, and is a diagram for explaining that the compare processing is performed by the host controller and the verify processing is performed by a library controller;

"FIG. 10 is a diagram for explaining the fourth embodiment of the present invention, and is a diagram for explaining a processing flow of the host controller;

"FIG. 11 is a diagram for explaining the fourth embodiment of the present invention, and is a diagram for explaining a processing flow of the library controller;

"FIG. 12 is a diagram for explaining a fifth embodiment of the present invention, is a diagram for explaining the write processing, the compare processing, and the verify processing in the optical disk library that houses and uses multiple optical disks, and is a diagram for explaining that the compare processing is performed by the host controller and the verify processing is performed by the optical disk drive;

"FIG. 13 is a diagram for explaining the write processing and the verify processing on the optical disk in the conventional optical disk drive;

"FIG. 14 is a diagram for explaining the write processing and the verify processing on the optical disk in the conventional optical disk drive, and is a diagram for explaining timings at which the write processing and the verify processing are performed and their processing times;

"FIG. 15 is a diagram for explaining the write processing, the compare processing, and the verify processing on the optical disk in the conventional optical disk drive; and

"FIG. 16 is a diagram for explaining the write processing, the compare processing, and the verify processing on the optical disk in the conventional optical disk drive, and is a diagram for explaining timings at which the write processing, the verify processing, and the compare processing are performed and their processing times."

For additional information on this patent application, see: OKAMOTO, Tomomi; FUJITA, Shinji; YASUKAWA, Takakiyo; KOBAYASHI, Masayuki. Recording/Reproducing Device and Optical Disk Library Device. Filed January 15, 2014 and posted August 7, 2014. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=4072&p=82&f=G&l=50&d=PG01&S1=20140731.PD.&OS=PD/20140731&RS=PD/20140731

Keywords for this news article include: Information Technology, Hitachi-LG Data Storage Inc., Information and Data Storage.

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Source: Information Technology Newsweekly


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