WO2007148302A2 - Lecteur de disques optiques à vitesse d'enregistrement adaptable - Google Patents

Lecteur de disques optiques à vitesse d'enregistrement adaptable Download PDF

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Publication number
WO2007148302A2
WO2007148302A2 PCT/IB2007/052405 IB2007052405W WO2007148302A2 WO 2007148302 A2 WO2007148302 A2 WO 2007148302A2 IB 2007052405 W IB2007052405 W IB 2007052405W WO 2007148302 A2 WO2007148302 A2 WO 2007148302A2
Authority
WO
WIPO (PCT)
Prior art keywords
recording
data
transfer rate
data transfer
recording speed
Prior art date
Application number
PCT/IB2007/052405
Other languages
English (en)
Other versions
WO2007148302A3 (fr
Inventor
Jurgen M. Vangeel
Original Assignee
Koninklijke Philips Electronics N.V.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Publication of WO2007148302A2 publication Critical patent/WO2007148302A2/fr
Publication of WO2007148302A3 publication Critical patent/WO2007148302A3/fr

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/10009—Improvement or modification of read or write signals
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/10527—Audio or video recording; Data buffering arrangements
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/10527—Audio or video recording; Data buffering arrangements
    • G11B2020/1062—Data buffering arrangements, e.g. recording or playback buffers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B2020/10935—Digital recording or reproducing wherein a time constraint must be met
    • G11B2020/10944—Real-time recording or reproducing, e.g. for ensuring seamless playback of AV data
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B2020/10935—Digital recording or reproducing wherein a time constraint must be met
    • G11B2020/10981—Recording or reproducing data when the data rate or the relative speed between record carrier and transducer is variable
    • G11B2020/1099—Recording or reproducing data when the data rate or the relative speed between record carrier and transducer is variable wherein a disc is spun at a variable speed
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2537—Optical discs

Definitions

  • the present invention relates to a method of recording onto an optical disc comprising receiving the data to be recorded from a source and recording said data in real time onto the optical disc at a desired recording speed.
  • This invention also relates to a recording device for recording data onto an optical disc, comprising receiving means for receiving the data from a source, recording means for recording the data; and control means for controlling the recording means to record at a desired recording speed.
  • DVD+/-R(W) or a high-density disc such as BD-R(E) by an optical recording drive connected to a host computer, the host computer supplies the optical recording drive with the data to be written to the optical disc over a known interface such as, for example, IDE.
  • the data recording speed has increased constantly in time as the optical recording drive have become more performing over the years (higher recording speeds), for example from
  • US2005/0018659 describes a method of recording optical disc wherein, prior to starting the recording process, it is determined whether a desired recording speed is higher than a data transfer rate from the host computer to the data buffer and, if so, the recording speed is set to the data transfer rate and the disc recording is continued in a constant linear velocity mode (CLV) mode.
  • CLV constant linear velocity mode
  • the method as described in US2005/0018659 is only suitable to be used in the case that the data rate at which the host computer is able to supply data remains constant during the recording process, as data rate measurements are only performed prior to recording.
  • the data rate at which the host computer is able to supply data may vary during recording, including sharp decreases, for example due to the host computer executing another application that makes heavy use of the data bus or the processor, such as running Virus scan, viewing an encoded movie or moving files from one storage space to another.
  • the data rate at which the host computer is able to supply data may decrease abruptly so that no more data to be recorded is present in the buffer (so-called buffer underrun).
  • buffer underrun A known solution to this problem is to make use of seamless links.
  • linking specifically refers to the process of recording information onto an optical disc in an empty region immediately preceding or succeeding a recorded region.
  • seamless linking When linking is performed such that the information is recorded contiguously to the recorded areas without loss of available recording space, it is generally referred in the art as seamless linking.
  • seamless linking When linking is performed such that the information is recorded contiguously to the recorded areas without loss of available recording space, it is generally referred in the art as seamless linking.
  • seamless linking has negative consequences: data readout from disc areas immediately preceding or succeeding the linking point is difficult and the number of readout errors may increase due to an increase in jitter, therefore the quality of the recording is reduced.
  • the object of the invention is reached by a method according to claim 1.
  • the recording speed is not reduced due temporary interruptions in data transfer. Only in the case of persistent reduced data transfer rates, or regular interruptions leading to a reduced average data transfer rates the recording speed is reduced according to the invention.
  • the recording speed is reduced to a value corresponding to the measured average data transfer rate. This measure insures recording at a maximum recording speed that still ensures a high quality of the recording.
  • the time to record the disc increases to a value in the order of 30 minutes.
  • measurements of the average data transfer rate indicate for example that the host computer is only able to supply data at a speed of 2x only. Consequently the recording speed is reduced to 2x.
  • the method further comprises the steps of buffering the received data in a data buffer before recording and performing a seamless linking if the data buffer becomes empty.
  • This measures ensures the ability to handle sudden drop in data transfer rate, i.e. the possibility of executing a seamless links.
  • measuring the data transfer rates is only possible prior to recording, as in said method the time to fill an empty buffer when no data is extracted from said buffer is measured. Therefore such a method is not suitable for use during recording, as it would require stopping recording, measuring the data transfer rate and performing a seamless link afterwards, therefore increasing recording time and reducing recording quality.
  • the method according to the invention is characterized by the step of measuring an average data transfer rate further comprising reserving part of the data buffer for average data transfer rate measurements, emptying the reserved part of the data buffer and measuring the rate at which the source is able to fill the reserved part.
  • the method according to the invention further comprises the step of increasing the recording speed if the average data transfer rate exceeds a high threshold value depending on the recording speed.
  • This measure ensures that, when the data transfer rate is restored, for example when the application running on the host computer causing the reduction has stopped, that the recording speed is increased, preferably either to the newly measured value of data transfer rate or the desired recording speed.
  • the recording speed is increased accordingly. This ensures that the total recording time remains similar to the known recording method, while the quality of the recording is increased by not making use of seamless links.
  • This application also related to a recording device for recording data onto an optical disc
  • FIG. 1 illustrates schematically a known optical disc
  • Fig. 2 shows schematically an optical scanning apparatus wherein the invention is practiced
  • Fig. 3 illustrates by means of a flow diagram a method of recording data onto an optical disc according to an embodiment the invention
  • Fig 4 illustrates a known method of using a buffer during the recording process.
  • Fig. 5 illustrates a method according to the invention of using a buffer for measuring an average data transfer rate.
  • Fig. Ia illustrates schematically an optical disc 11 having a track 12 and a central hole 10.
  • the track 12 being the position of the series of (to be) recorded marks representing information, is arranged in accordance with a single spiral pattern constituting substantially parallel tracks on an information layer.
  • the optical disc may comprise one or more information layers of a recordable type.
  • recordable optical discs are CD-RW, or DVD+/-RW, DVD-RAM or BD-RE for the rewritable type and CD-R, DVD+/-R or BD-R for the write once type.
  • further details about the physical structure and addressing information for DVD+/-RW optical discs can be found in references ECMA-337 and ECMA-338, respectively.
  • the information is represented on the information layer by recording optically detectable marks along the track, e.g. crystalline or amorphous marks in phase change material.
  • the track 12 on the optical disc is indicated by a pre- embossed track structure provided during manufacture of the blank optical disc.
  • the track structure is constituted, for example, by a pregroove, which enables a read/write head to follow the track during scanning.
  • the track structure comprises a periodical known in the art as wobble, so that information, modulation of said periodical variation being used for encoding further information such as physical addresses for indication the location of stored units of information.
  • the position information may include specific synchronizing marks for locating the start of such information blocks.
  • the optical disc 11 is intended for carrying user information according to a standardized format, to be playable on standardized playback devices.
  • the recording format includes the way information is recorded, encoded and logically mapped onto the recording space provided by the track 12 and it will be described with reference to Fig Ib.
  • the recordable space is usually subdivided into a lead-in area, a data zone for recording user data and a lead-out area and it is addressable by means of sequentially numbered units known as physical sectors.
  • the lead-in area usually comprises an area 13 wherein basic disc management information is stored and a disc description area 14 wherein the information how to physically access the data zone is provided.
  • said disc management information corresponds to the table of contents in CD systems or the formatting disc control blocks in DVD systems.
  • the user data in the data zone is arranged according to a file system comprising file management information, such as ISO 9660 used in CD systems (available as ECMA-119) or UDF used in DVD systems (available as ECMA 167).
  • file management information is mapped on a predefined location 15 on the optical disc 11 , usually in or directly after the lead-in area.
  • the user information may be further arranged according to an application format, for example comprising a predefined structure of files and directories. Fig.
  • the device is provided with recording means for scanning the track on the optical disc, the recording means comprising a drive unit 16 for rotating the optical disc 11, a head 18, a positioning unit 21 for coarsely positioning the head 18 in the radial direction on the track, and a control unit 17.
  • the head 18 comprises an optical system of a known type for generating a radiation beam 20 guided through optical elements focused to a radiation spot 19 on a track of the information layer of the optical disc.
  • the radiation beam 20 is generated by a radiation source, e.g. a laser diode.
  • the head further comprises (not shown) a focusing actuator for moving the focus of the radiation beam 20 along the optical axis of said beam and a tracking actuator for fine positioning of the radiation spot 19 in a radial direction on the center of the track.
  • the tracking actuator may comprise coils for radially moving an optical element or may alternatively be arranged for changing the angle of a reflecting element.
  • the radiation reflected by the information layer is detected by a detector of a usual type, e.g. a four-quadrant diode, in the head 18 for generating a read signal and further detector signals, such as a tracking error and a focusing error signal for controlling said tracking and focusing actuators.
  • a detector of a usual type e.g. a four-quadrant diode
  • the device For recording information the radiation beam 20 is controlled to create optically detectable marks in the recording layer.
  • the device comprises write processing means for processing input information to generate a write signal to drive the head 18, which write processing means comprise an input unit 23, and data processing means comprising a formatter 24 and a modulator 25.
  • the control unit 17 controls the recording and retrieving of information and may be arranged for receiving commands from a user or from a host computer 30.
  • the control unit 17 may comprise control circuitry, for example a microprocessor, a program memory and control gates, for performing the procedures described below.
  • the control unit 17 is connected via control lines 22, e.g. a system bus, to said input unit 23, formatter 24 and modulator 25, to the drive unit 16, and to the positioning unit 21.
  • the control unit 17 comprises control circuitry, for example a microprocessor, a program memory and control gates, for performing the procedures and functions according to the invention as described below.
  • the control unit 17 may also be implemented as a state machine in logic circuits.
  • the input unit 23 receives and pre-processes the user information.
  • the input unit 23 may comprise of compression means for input signals such as analog audio and/or video, or digital uncompressed audio/video. Suitable compression means are described for audio in WO 98/16014-A1 (PHN 16452), and for video in the MPEG2 standard.
  • the input signal may alternatively be already encoded.
  • the output of the input unit 23 is passed to the formatter 24 for adding control data and formatting the data according to a recording format, e.g. by adding error correction codes (ECC) and/or interleaving.
  • ECC error correction codes
  • For computer applications units of information may be interfaced to the formatter 24 directly.
  • the formatted data from the output of the formatter 24 is passed to the modulation unit 25, which comprises for example a channel coder, for generating a modulated signal, which drives the head 22. Further the modulation unit 25 comprises synchronizing means for including synchronizing patterns in the modulated signal.
  • the formatted units presented to the input of the modulation unit 25 comprise address information and are written to corresponding addressable locations on the optical disc under the control of control unit 17.
  • the control unit 17 is arranged for recording and retrieving position data indicative of the position of the recorded information volumes.
  • marks representing the information are formed on the optical disc 11.
  • the marks may be in any optically readable form, e.g. in the form of areas with a reflection coefficient different from their surroundings, obtained when recording in materials such as dye, alloy or phase change material, or in the form of areas with a direction of magnetization different from their surroundings, obtained when recording in magneto-optical material.
  • Writing and reading of information for recording on optical disks and usable formatting, error correcting and channel coding rules are well-known in the art, e.g. from the CD system.
  • the read signal is processed by a read processing unit comprising a demodulator 26, a de-formatter 27 and an output unit 28 for outputting the information.
  • the functioning of the demodulator 26, the de-formatter 27 and the output unit 28 are controlled by the controller 17.
  • retrieving means for reading information include the drive unit 16, the head 18, the positioning unit 21 and the read processing unit.
  • Data to be recorded by the recording device 1 is provided by a source 30, such as a host computer to the input means 23. This may take place via known communication interfaces such as IDE or USB.
  • the transferred data to be recorded is further buffered by means of a buffer 29.
  • the buffer 29 may be integrated in the input means 29 or in the control unit 17.
  • the control unit 17 is further adapted, for example by means of suitable firmware, for implementing the method of recording an optical disc according to the invention, as described with reference to Fig. 3.
  • Fig. 3 illustrates by means of a flow diagram a method of recording an optical disc according to the invention.
  • step 33 D AT A-TRANSF a recording command is issued and data transfer is initiated for a data source, for example such as a host computer, to the recording apparatus.
  • the data to be recorded is temporarily stored in a recording buffer, and as soon as the recording buffer is full, the recording process is initiated.
  • step 34 the data transfer rate is monitored.
  • a known method of measuring a data transfer rate from host and a method of measuring a data transfer rate according to the invention will be described later with respect to figures 4 and 5, respectively
  • step 35 the measurement of the data rate is compared against a threshold value, which normally correspond to data transfer rate necessary for being able to record at the desired recording speed. If the average data transfer is found too low, the recording speed is reduced in step 37 (SPEED DOWN). It is noted that optionally, if needed, a step 36 wherein a (seamless) link is performed (SEAM_LINK) precedes the step 37 of reducing the recording speed.
  • a threshold value normally correspond to data transfer rate necessary for being able to record at the desired recording speed.
  • the source may provides the data to be recorded in short bursts or the source is unable to provide new data during short intervals and the recording buffer may run empty regularly. Consequently, an average data transfer rate from source to recording apparatus may still be satisfactory, that is exceeding a desired recording speed, but the recording buffer may run empty regularly.
  • a seamless link step 36 is performed every time the buffer run empty due to sudden drops in performance. Because of said seamless links, recording quality might be below the user expectation.
  • a relevant measure for the number of sudden drops in performance is the number of seamless links that were executed in a predetermined period of time.
  • step 38 VAR CHK
  • step 38 VAR CHK
  • the recording speed is reduced accordingly.
  • the new recording speed is chosen such as to match the speed the source is able to transfer data as good as possible.
  • step 40 SPEED UP
  • step 40 SPEED UP
  • step 41 the recording speed is increased, preferably either to the newly measured value of data transfer rate or the desired recording speed if the measured value of the data transfer rate is higher than the desired recording speed.
  • the recording speed is increased accordingly. This ensures that the total recording time remains similar to the known recording method, while the quality of the recording is increased by not making use of seamless links.
  • step 42 the recording process is continued.
  • FIG 4 illustrates a known method of using a buffer during the recording process.
  • a data buffer 29 comprises stored data 40 and it further comprises a data input (IN) and a data output (OUT).
  • the data buffer 29 works according to the first-in first-out (FIFO) principle.
  • FIFO first-in first-out
  • the buffer 29 is full prior to beginning the recording process, a part 41 of the data in the buffer (indicated by the hashed lines) being recorded over a predefined period a time.
  • the data buffer is shown after the part 41 has been recorded, now the buffer comprising an empty part 42 .
  • Hashed region 43 indicates the data that the source is able to transfer to the data buffer 29.
  • the data buffer 29 becomes full again, as illustrated in figure 4(c) from the sequence.
  • the host is not able to transfer data to the data buffer at a proper rate, the amount of transferred data 43 to the data buffer 29 is smaller than the amount of data 41 recorded from the data buffer 29, so a part 44 of the data buffer 29 will become empty as illustrated in figure (c) from the sequence.
  • the empty part 46 of the data buffer 29 is increasing as illustrated in figure 4d. Due to the fact that data is continuously transferred to the buffer and taken out of the buffer, a quantitative measurement of the average data transfer rate is difficult to obtain.
  • a qualitative indication that the data transfer rate is not sufficient is obtained when it is observed that the buffer is running empty. Moreover, as long as the buffer is full, no indication can be obtained about the maximal rates at which the host is able to supply data, as long as the present data transfer rate matched the recording speed.
  • Fig. 5 illustrates a method according to the invention of using a buffer for measuring an average data transfer rate.
  • the data buffer 29 comprises stored data 50 and it further comprises a data input (IN) and a data output (OUT).
  • the data buffer 29 works according to a first-in first-out (FIFO) principle.
  • FIFO first-in first-out
  • the data buffer 29 is full prior to beginning the recording process, a part 51 of the data in the buffer being recorded over a period a time.
  • the data buffer is shown after the part 51 has been recorded, now the buffer comprising an empty part 52 .
  • Hashed region 53 indicates the data that the source is able to transfer to the buffer 29.
  • a part of the data buffer 29 is reserved for speed measurement, as indicated by the dashed line in fig 5b.
  • the empty part of the buffer is not made directly available for transferring data from the source, but used for measurement of the data transfer rate as illustrated in fig 5c.
  • the source is able to transfer a certain amount of data 56 per unit time. For example, the time necessary for the source to fill the reserved part 57 of the data buffer 29 is measured, therefore providing a value of the maximal data transfer rate from source to data buffer 29.
  • An alternative embodiment is illustrated in figs 5d and 5e.
  • the reserved part 57 has been emptied, the reservation is removed and the simultaneous process of transferring data 56 to the data buffer 29 and removing data 5 from the data buffer 29 due to recording process continues.
  • the filling level 58 of the buffer indicate the relation between the data transfer rate and the recording speed. If, as illustrated in fig 5d, the data buffer 29 is filling fast, it indicates that the device is able to record data at higher speeds, and the recording speed may be increased accordingly. If the filling level remains constant, this indicates the present recording speed is appropriate for the moment. If the filling level is reduced, as illustrated in figure 5e, it indicates that the present recording speed exceeds the data transfer rate from source to data buffer 29, therefore the recording speed may need to be reduced.
  • the recording speed is controlled by the control unit 17, by controlling the rotational speed of the drive unit 16.
  • the recording apparatus is further provided with means 31 for measuring the data transfer rate, which may preferably be integrated within the control unit 17.
  • Such means 31 for measuring the data transfer rate may either be provided as separate circuits or, preferably, by means of suitable firmware enabling using the buffer 26 for measuring an average data transfer rate as described with reference to Fig. 5.
  • the control unit 17 further comprises decision means for deciding to increase or reduce a recording speed according to the method as described with reference to Fig 3.
  • the user may choose whether (s)he decides to record data at adaptable speeds according to the invention or (s)he decides to record according to the known method. Basically, if the user is mostly interested for recording quality, such as using the disc for archiving purposes, (s)he may choose to record at adaptable speed according to the invention, while, if the user is interested in recording the optical disc as fast as possible, he may chose to always go to the highest speed possible and make use of seamless links if necessary.
  • the user's decision with respect to the which recoding method to use may be indicated to the recording device by means of using the mode page. It is known that the mode pages can be read out / set by using the mode sense and mode select commands.
  • the mode pages are known commands used to put the recording device in a certain operating mode, for example for indicating to the recording apparatus whether data or audio is to be recorded no packets / fixed packets / variable packets or for indicating whether to use seamless linking or not.
  • the recoding apparatus is enabled to recognize the following write modes pages: a page corresponding to no use of seamless linking; a page corresponding to fastest recording, that is using of seamless linking without adapting the recording speed; a page corresponding to using both seamless linking for recording and adapted the recording speed as described with reference to figure 3.
  • a computer program may be stored/distributed on a suitable medium, such as optical storage or supplied together with hardware parts, but may also be distributed in other forms, such as being distributed via the Internet or wired or wireless telecommunication systems.
  • a suitable medium such as optical storage or supplied together with hardware parts
  • a computer program may also be distributed in other forms, such as being distributed via the Internet or wired or wireless telecommunication systems.
  • system/device/apparatus claim enumerating several means several of these means may be embodied by one and the same item of hardware or software. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measured cannot be used to advantage.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)

Abstract

La présente invention concerne un procédé d'enregistrement de données sur un disque optique comprenant les étapes de réception des données provenant d'une source, d'enregistrement desdites données en temps réel sur le disque optique, de surveillance en continu d'un débit moyen de transfert de données sur une période prédéterminée depuis la source et de réduction de la vitesse d'enregistrement si le débit moyen de transfert de données est inférieur à une valeur seuil, la valeur seuil dépendant d'une vitesse d'enregistrement souhaitée. Avantageusement, la vitesse d'enregistrement est accrue si le débit moyen de transfert s'accroît au-dessus d'une seconde valeur seuil dépendant de la vitesse d'enregistrement souhaitée, adaptant donc constamment la vitesse d'enregistrement au débit moyen de transfert. Avantageusement, le nombre de liens ininterrompus devant être effectués dans une certaine période de temps est également surveillé et la vitesse d'enregistrement est adaptée en conséquence.
PCT/IB2007/052405 2006-06-23 2007-06-21 Lecteur de disques optiques à vitesse d'enregistrement adaptable WO2007148302A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP06115979.4 2006-06-23
EP06115979 2006-06-23

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WO2007148302A2 true WO2007148302A2 (fr) 2007-12-27
WO2007148302A3 WO2007148302A3 (fr) 2008-03-27

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7957235B2 (en) * 2007-09-21 2011-06-07 Teac Corporation Disk drive and information processing system having the same

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1018741A1 (fr) * 1999-01-06 2000-07-12 SANYO ELECTRIC Co., Ltd. Controle pour suspendre l'enregistrement de données sur un disque
WO2004102555A1 (fr) * 2003-05-19 2004-11-25 Koninklijke Philips Electronics N.V. Procede de reglage de la vitesse d'un support de donnees dans un appareil du type unite de support de donnees

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1018741A1 (fr) * 1999-01-06 2000-07-12 SANYO ELECTRIC Co., Ltd. Controle pour suspendre l'enregistrement de données sur un disque
WO2004102555A1 (fr) * 2003-05-19 2004-11-25 Koninklijke Philips Electronics N.V. Procede de reglage de la vitesse d'un support de donnees dans un appareil du type unite de support de donnees

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7957235B2 (en) * 2007-09-21 2011-06-07 Teac Corporation Disk drive and information processing system having the same

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TW200809808A (en) 2008-02-16
WO2007148302A3 (fr) 2008-03-27

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