WO2006126132A1 - Thermal management for optical drives with buffer memory - Google Patents

Thermal management for optical drives with buffer memory Download PDF

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Publication number
WO2006126132A1
WO2006126132A1 PCT/IB2006/051498 IB2006051498W WO2006126132A1 WO 2006126132 A1 WO2006126132 A1 WO 2006126132A1 IB 2006051498 W IB2006051498 W IB 2006051498W WO 2006126132 A1 WO2006126132 A1 WO 2006126132A1
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WIPO (PCT)
Prior art keywords
buffer
drive
data
optical drive
time
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PCT/IB2006/051498
Other languages
French (fr)
Inventor
Arnaud F. W. Gouder De Beauregard
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Koninklijke Philips Electronics N.V.
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Publication date
Application filed by Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Publication of WO2006126132A1 publication Critical patent/WO2006126132A1/en

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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
    • G11B33/14—Reducing influence of physical parameters, e.g. temperature change, moisture, dust
    • G11B33/1406—Reducing the influence of the temperature
    • G11B33/144—Reducing the influence of the temperature by detection, control, regulation of the temperature
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/02—Control of operating function, e.g. switching from recording to reproducing
    • G11B19/04—Arrangements for preventing, inhibiting, or warning against double recording on the same blank or against other recording or reproducing malfunctions
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/36—Monitoring, i.e. supervising the progress of recording or reproducing
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
    • G11B7/126—Circuits, methods or arrangements for laser control or stabilisation

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

An apparatus and a method for the thermal management of an optical drive are disclosed. An optical drive (504, 506) for reading and/or writing data from and/or to a media, the optical drive having a drive rate F (520) and a buffer (512) having a buffer size B for buffering data, wherein the buffer (512) is transferring data to an application (508) or receiving data from an application (510) at an application data rate R (522) is provided. The optical drive (504, 506) is adapted to operate in an on and off duty cycle ratio during thermal management, the ratio being determined based on R (522) and F (520) and a maximum off duty time, in order to provide a transparent thermal management of the optical drive.

Description

THERMAL MANAGEMENT FOR OPTICAL DRIVES WITH BUFFER MEMORY
FIELD OF THE INVENTION
The invention relates to thermal management for an optical drive and in particular to an apparatus and a method for controlling the thermal management of an optical drive in order to improve read or write performance of the optical drive system.
BACKGROUND OF THE INVENTION
Optical drive systems, e.g. such systems as: CD-ROM, CD-R, CD-RW, DVD, BIu Ray, etc. are more and more widespread both for data recording and/or reading purposes in a variety of applications. Optical drive systems are continuously being improved e.g. in order to optimise performance. One important parameter in the improvement of optical drive systems is the thermal management of the optical drive.
Within current optical drives, special measures are often needed to ensure that the drive does not get too hot. If the drive gets too hot this will decrease the read and/or write quality or even decrease the drive and/or system lifetime. A system lifetime decrease may be due to a laser degradation or degeneration. To solve this problem some drives use thermal management. Thermal management may be provided in a way that the drive stops reading or writing shortly in a periodic way in order to let the system cool down. The periodic starting and stopping may be done in a duty-cycling way, where the drive reads or writes a bit of data, then the drive goes into a special cool down mode for a while where the drive is not reading or writing. This cycle is continued for as long as needed for the system to cool down. When the drive reads or writes it is normally understood that the drive is on duty and vice versa.
The user of the drive sees duty cycling as a decrease in read or write performance. If duty cycling is done with equal read or write and cool down times, it may effectively halve the performance.
In the published US application 2002/0186630 a buffer manager always monitors the size of data buffered on a buffer. If it is detected that the size of data buffered in the buffer has become smaller than a predetermined size, the buffer manager generates a buffer under run. Upon receiving the buffer under run a system controller interrupts recording operation. When the size of data is larger than or equal to the predetermined size the buffer under run is cancelled and the system controller restarts the interrupted recording operation. Recording interrupt factors include an abnormal internal temperature of the optical disk device. The inventor of the present invention has appreciated that an improved thermal management for an optical drive system is of benefit, and has in consequence devised the present invention.
SUMMARY OF THE INVENTION The present invention seeks to provide an improved thermal management for an optical drive system. Preferably, the invention alleviates, mitigates or eliminates one or more of the above or other disadvantages singly or in any combination.
Accordingly there is provided, in a first aspect, a method of controlling the thermal management of an optical drive system, the optical drive system comprising: - an optical drive with a drive rate F for reading and/or writing data from and/or to a media,
- a buffer having a buffer size B for buffering data, wherein the buffer is transferring data to an application or receiving data from an application at an application data rate R - a control logic wherein the method comprises the steps of
- determining the drive rate F
- determining the application data rate R
- determining a duty cycle ratio between the on duty cycle time and the total cycle time of the optical drive based on the application rate R and the drive rate F and
- determining a maximum off duty time
- operating the optical drive in accordance with the determined duty cycle ratio and the maximum off duty time.
The optical drive may, in particular during thermal management, be operating on or off duty in an on/off duty cycle. In operation a dataflow is from the drive to the buffer and from the buffer to the application when the drive is reading. When the drive is in a write mode the data flow is from the application to the buffer and from the buffer to the drive.
A method of controlling the thermal management of an optical drive system is thus provided where the optical drive is operated in accordance with the determined duty cycle ratio and a maximum off duty time, i.e. to avoid the buffer from under running when operating the drive in a duty cycle during a read mode or i.e. to avoid the buffer from over running when operating the drive in a duty cycle during the write mode. The thermal management may be controlled by the control logic of the optical drive system. Claim 1 is also advantageous i.e. since by the described the thermal management of the drive system will be controlled in accordance with the application rate R needed by the application and the performance of the drive given by the drive rate F and in accordance with the size of the buffer. The advantage is in other words that the optical drive system will be aware of the way the application is using it and therefore be able to perform accordingly. The optical drive system will e.g. know if the application wants to read or write at the maximum speed, or if actually the application is satisfied with a lower speed, as long as this is guaranteed at all times.
Claim 1 is furthermore advantageous since by controlling the drive system in accordance with claim 1 a predetermined dataflow from or to the media in the optical drive is guarantied. The result of a guarantied dataflow fulfilling the need of the application while providing a needed thermal management of the drive will e.g. be no hiccups in a video being displayed when reading or no missing of data when writing.
Claim 1 is furthermore advantageous since by controlling the drive system in accordance with claim 1 the thermal management may be optimised and hereby the lifetime of the optical drive system and particularly a light source such as a laser of the optical drive system is optimized.
The optional steps of claim 2 and 3 are advantageous since operating the drive with a minimum on duty cycle time is one way of providing an optimized thermal cool down of the optical drive. The thermal cool down will be provided while still fulfilling the need of the application at the given performance of the drive operated with the minimum on duty cycle time.
The optional method steps of claim 4 and 5 are advantageous since by providing a threshold a further security that a buffer under run or a buffer over run is provided. The optional method steps of claim 6 and 7 are advantageous since by operating the drive with an on duty cycle time ensuring a certain amount of data in the buffer according to the claims, e.g. a flexibility of a choice of duty cycle is provided. This flexibility may e.g. be used for allowing a duty cycle that provides an amount of data in the buffer that is slightly increasing or decreasing. The increase of data in the buffer may in particular be provided for an optical drive system in a read mode and the decrease may in particular be provided for an optical drive system in a write mode.
According to additional aspects of the invention there is provided an optical drive system, a control logic, an optical data storage and a computer readable code adapted to perform the steps of the method of controlling the optical drive system.
The maximum off duty time, also called a maximum cool down time, of the optical drive system may be determined by the time to empty the buffer from a certain filling level when the drive is not reading. In a write mode of the optical drive the maximum off duty time is the time to fill the buffer from a certain filling level when the drive is not writing.
The off duty time is the time to empty the buffer from a level of the useable size B of the buffer and is therefore be given by the ratio of B divided by the application rate R. This equation also applies for a writing drive.
Similarly, the on duty time of the buffer of a drive in reading mode, which is the same as a maximum emptying time of a drive in writing mode is given by the useable buffer size B divided by the drive rate R minus the application rate F.
The step of determining the maximum off duty time or the maximum on duty time of the drive system is advantageous since hereby e.g. a buffer size is chosen in order to fit the optical drive system and to prevent buffer under run or buffer over run. An operation mode that the optical drive is used in may be determined.
Determining the mode may comprise determining if the optical drive is used for reading or writing, and hereby determining if the drive rate F and the application rate R is an input to or an output from the buffer. A possible advantage by determining the mode of the drive is that hereby it can e.g. be determined if it is buffer under run or buffer over run that is prevented by controlling the thermal management in accordance with the determined duty cycle.
In general the various aspects of the invention may be combined and coupled in any way possible within the scope of the invention, and therefore the described advantages may be valid for all aspects of the invention.
These and other aspects, features and/or advantages of the invention will be apparent from and elucidated with reference to the embodiments described hereinafter.
BRIEF DESCRIPTION OF THE DRAWINGS
Embodiments of the invention, unless otherwise noted, will be described, by way of example only, with reference to the drawings, in which FIG.l is a graph showing an explanatory buffer filling level of an optical drive during ordinary operation.
FIG.2 is a graph showing an explanatory buffer filling level of an optical drive with a thermal management according to prior art. FIG.3 is a graph showing an explanatory buffer filling level of an optical drive with a relative short thermal management duty cycle time.
FIG.4 is a graph showing an explanatory buffer filling level of an optical drive with a relative long thermal management duty cycle time.
FIG. 5A and FIG. 5B show principle drawings of an optical drive system during a read mode in figure 5 A and during a write mode in figure 5B.
FIG. 6 is a flow diagram of a method of controlling the optical drive system.
DESCRIPTION OF PREFERRED EMBODIMENTS
FIG.l is a graph showing an explanatory buffer filling level in megabytes as a function of time in seconds of an optical drive during ordinary operation. The example is showing a buffer filling level for a buffer of a streaming playback application.
The application requires to playback a data stream at an application rate of 2 MB/s. The application communicates with the optical drive by sending read commands to the optical drive. Each read command asks for 64 KB of data. This means that a control logic will send 32 of these commands each second. Every time such a read command is sent to the drive, data should be available for the application. Alternatively, the data should be sent at the latest before the application wants to send the next read command.
The optical drive is capable of reading data at a drive rate of 3.2 MB/s from a media placed in the optical drive. The media in this example is a disc such as a CD. In the example a size of the buffer is chosen to be 8MB as indicated by the arrow with reference number 101.
When the first read command is sent to the optical drive, the optical drive starts filling the buffer with a drive rate F of 3.2 MB/s. Since data is requested by the application at an application rate R of only 2 MB/s the buffer will be full, as shown with reference number 102 in the Figure, and the drive stops reading. When the drive stops reading the buffer is emptied at the application rate. Whenever the buffer gets below a certain threshold size, e.g. 2 104, the drive will restart reading again 106. When the optical drive starts reading again the filling rate of the buffer while the application is still requesting data is 1,2 MB/s. Therefore the time to fill the buffer is 5 seconds 108. When there is 8 MB of data in the buffer the drive stops reading and the drive normally starts reading again at the threshold value after three seconds 110. The maximum amount of time that the drive can stop reading any data is 4 seconds, because if the drive waits without reading longer than 4 seconds, the buffer will under run, and the video playback will stop.
The application data rate, the drive rate, the buffer size and the threshold value in this example are the same for all the following examples. It is however underlined that these parameters may have any other suitable size.
FIG. 2 is a graph showing an explanatory buffer filling level of the streaming playback application as a function of time of an optical drive with a thermal management according to the prior art.
It is detected, e.g. by a temperature detection means comprised within the optical drive system, that the drive is too hot. As the drive is too hot it is decided to go into a thermal cool down mode in which the drive reads data for 5 seconds 202, and then goes into a cool down mode for 5 seconds as shown at 204. When the drive does not read any data for 5 seconds the buffer under runs at approximate t = 19 s 206 where the buffer level reaches zero. A buffer under run results in a video that is stopped or result in a hiccup if the video playback application is fast to ask for other data.
In FIG. 3 a filling level of a buffer operated according to the method of the present invention is shown. The graph is showing an explanatory buffer filling level of the streaming playback example as a function of time of an optical drive with a relative short thermal management duty cycle. The duty cycle is determined as described in the following.
• The application's data rate R is determined. R is in the examples 2 MB/s.
R is the application rate with which the application requests data from the buffer during a read mode and the rate with which the application inputs data to the buffer in a write mode.
• The drive rate F with which the drive can read data from the disc and/or write data to the disc is determined. F is in the examples 3.2 MB/s.
F is the drive rate with which the drive can input data to the buffer during a read mode, and the drive rate with which the drive can write data from the buffer to the media in a write mode.
A definition of on/off duty during a read mode of the optical drive is: OFF duty = there is only outputted data from the buffer at the application rate R. ON duty = there is both inputted data to the buffer at drive rate F and outputted data from the buffer at the application rate R.
A definition of on/off duty during a write mode of the optical drive is: OFF duty = there is only inputted data to the buffer at the application rate R. ON duty = there is both inputted data to the buffer at application rate R and outputted data from the buffer at the drive rate F.
• The threshold value is determined. The threshold value in the examples is 2 MB.
The threshold value may be used as a level at which level the filling of the buffer is started again in a read mode for safety reasons and/or as a threshold value to be used in a write mode.
• The buffer size of the buffer used with the drive is determined. The useable buffer size B is then given by the buffer size minus any threshold value. The buffer size in the examples is chosen to 8 MB and B therefore equals 6 MB.
One or more of the determination(s) of the values R, F, one or more threshold values and the buffer size may be provided e.g. by a measurement of the values by the control logic or due to the values being known by the control logic in any other way. The one or more determination(s) may also be provided on the basis of a calculation.
Normally, the drive rate is not a fixed property of the drive. The drive rate also depends on e.g. the type of disc, the quality of the disc, scratches or dust on the disc. The application rate may also be varying. All of the mentioned determinations may therefore e.g. be provided continuously and/or in a periodic way such as to operate the system in accordance with the provided determinations.
In the example given here the buffer size and threshold value are fixed values and the application rate is measured and the drive rate is known. From these values and definitions, a control logic can determine what duty cycle is minimum needed to ensure that the application can still continue streaming without a buffer under run (in a read mode) or a buffer over run (in a write mode), despite of the fact that the drive is performing thermal management.
An on duty time Tl is given by: Tl = B / (F-R) The buffer is filled during read mode and emptied during write mode in Tl seconds.
An off duty time T2 is given by: T2 = B/R
The buffer is emptied during read mode and filled during write mode in T2 seconds. In order to understand Tl and T2 an example of the interpretation of Tl is given in the following. Tl is a minimum on duty time the drive have to read in order for a certain following off duty time not to result in a buffer under run. The time Tl can also be a maximum on duty time the drive can be reading before the buffer is full due to the buffer size available, the drive rate and the application rate.
A minimum duty cycle ratio can be determined as the maximum on duty time that the drive is filling the buffer in a read mode, divided by the time that the drive is filling the buffer and the time that the buffer is emptying the buffer in read mode which is the same as the total of the maximum off duty time and the maximum on duty time, therefore i.e. the • Minimum needed on duty cycle ratio is given by Tl / (T2 + Tl) = R / F.
A maximum cool down time should not be larger than the time that the buffer takes to go from completely full (in a read mode of the optical drive) or completely empty (in a write mode) to a limit of the buffer. Therefore the maximum cool down time is the useable buffer size divided by the rate with which the application request data: • Maximum cool down time = T2 = B/R.
The maximum cool down time equals the maximum off duty time. This equation may e.g. alternatively be used to determine the buffer size B.
The minimum on duty cycle ratio is only a relative value of the filling time compared to the total duty cycle time. For example a first duty cycle with 1 second read time and 0.5 second cool down time and a second duty cycle with 10 seconds read time and 5 seconds cool down time both have a duty cycle of 67%.
However, the buffer size, possibly minus the threshold value, is normally a fixed value. This means that there is an upper limit for the time in which the drive is off duty. This upper limit is the maximum cool down time. Therefore the criterion of a minimum ratio of the time where the drive is on duty compared to the whole duty cycle time and the criterion of maximum off duty time may be described as equally important.
The second duty cycle will for the 8 MB buffer result in an under run because the reading period of the duty cycle must stop when the buffer is full at 8 MB and hereafter the reading period is followed by 5 seconds of cool down time with an application rate of 2 MB/s.
If the buffer size is not a fixed value the maximum cool down time can be adjusted to fit a dynamically changing buffer size.
The criterion minimum on duty cycle ratio AND the criterion maximum off duty time must both be taken into account, due to the fact that: • If the off duty time is too high, the buffer under runs, in a read mode example, and e.g. an image displayed by the application stops.
• If the duty cycle ratio is too low, the buffer also under runs, and again the image will stop. Therefore when the duty cycle ratio is determined as described, the buffer size must fit the maximum off duty time.
In the following example the drive measures that the application is requesting data at 2 MB/s. The optical drive system comprising the drive can calculate that the optical drive system should not use a duty cycle below a minimum duty cycle of 2 MB/s divided by 3.2 MB/s = 62.5%, meaning that in at least 62.5% of a complete cycle time the drive must be reading. Otherwise, the buffer will run empty.
As the invention may also be used with a write mode of the optical drive system, a minimum duty cycle of 62.5% means that the drive must be writing minimum 62.5% of the complete cycle time in order to prevent buffer over run. The buffer size is still 8 MB. The optical drive system can now e.g. determine a duty cycle with 1 (one) second read time and for every second that the optical drive reads data, the optical drive goes for 0.5 seconds into a cool down mode. This duty cycle fulfils the requirement of minimum 62.5% on duty cycle time as the read time divided by the whole cycle time is 0,67% (1 s/(l s+0,5 s)) and the off duty cycle time equals 0,33% (0,5 s/(l s+0,5 s)). The cool down time of 0,5 second also fulfils the requirement of the maximum cool down time, as the buffer size minus the threshold value divided by the application rate R equals 2 s (6 MB/2 MB/s).
In the example shown in FIG. 3 a duty cycle with one second on duty time (or read time in this example where the drive is in read mode) is shown at 302. During the one second read time the filling level is inclining 1,2 MB. The duty cycle has 0,5 second off duty time, as shown at 304, where the drive is not reading and therefore is lowering its temperature. The thermal management with this duty cycle is started at 301.
After a while the buffer will become lull. This is due to the duty cycle being chosen so that the time interval that the drive is on duty is larger than what is minimum needed with 0,5 second cool down time. In this example a minimum on duty time of the drive is not provided before the buffer is full. Therefore a maximum cooling of the drive is not provided. When the buffer is at the full limit the drive stops reading, and at 310 the drive therefore stops reading sooner than after 1 second. The optical drive can still go to the cool down mode for 0.5 seconds 306. Actually, the on duty time will become 0.833 seconds 308, resulting in a duty cycle of exactly 62.5% (0,833 s/(0,833 s+0,5 s)). If a maximum cooling of the drive was to be provided from the beginning of the thermal management, while still fulfilling the requirements of the application a duty cycle of 62.5% should have been chosen from the start. However in some cases it may be preferred to change the average filling level of the buffer slightly during thermal management and in other cases it may not. In the cases where the average filling level should not be changed the duty cycle determining the minimum duty cycle and therefore giving the minimum on duty time of the optical drive should be used. This also provides the maximum cooling of the optical drive.
The described way of providing thermal management may be called transparent thermal management as the optical drive is operated in accordance with the performance of the drive and the requested data rate by the application and therefore it is transparent to the drive system how it should be operated, especially during thermal management, in order to fulfil the data rate that the application requests. Because of this transparency the drive can now be used for streaming applications such as playing a movie or recording a broadcast, where the drive still delivers the required amount of data, while still doing thermal management.
The invention can e.g. be used in all optical drives where thermal management is needed.
In FIG.4 a filling level of a buffer operated according to the method of the present invention is shown. The graph is showing an explanatory buffer filling level as a function of time of an optical drive with a relative long thermal management duty cycle.
In this example a maximum cool down time of 3 s and a read time of 6 s is chosen. The 6 seconds read time is chosen as the double of the 3 s cool down time.
As can be seen now, the buffer will fill up for the second time as shown at 404 already after 5 seconds read time, as shown at 402, when a threshold of 2 MB is present. Therefore the real fill time, also called the on duty time, will be 5 seconds. After the 3 seconds of cool down time as shown at 406, the buffer will be exactly at the 2 MB level. So this automatically results in an ideal duty-cycle of 62.5% (5 s/(5 s+3 s)).
FIG. 5 A and FIG. 5B show principle drawings of an embodiment of the invention of an optical drive system during a read mode in figure 5 A and during a write mode in figure 5B. The optical drive system 502 and the drive 504 and 506 shown in figure 5A and 5B may be the same, but for the purpose of explanation the optical drive 504 during a read mode and during a write mode of the drive 506 is shown in two separate figures.
The application 508 may be any application capable of outputting the data from the buffer 512. The application in the read mode 508 may e.g. also be: an interface to a device, a display, a LCD display, an additional buffer, an optical drive or a hard disk or any combination thereof.
The application 510 may be any application capable of inputting the data to the buffer 512. The application in the write mode 510 may e.g. also be: an interface to a device, a camera, a video camera, an additional buffer, an optical drive or a hard disk or any combination thereof.
The buffer 518 may be any means such as a Random Accessible Memory capable of buffering the data.
The control logic 514 may e.g. be a separate unit as shown but may alternatively e.g. be comprised within the optical drive, the application or within or in connection with the buffer. Equally the buffer, the application and the drive may be separate units as shown or comprised in one or more units.
The control logic may be any kind of means e.g. capable of determining the drive rate F 520 and the application rate R 522 and e.g. capable of calculating the minimum on duty cycle ratio and the maximum off duty time.
As it in seen in the figures the drive rate F 520 during a read mode of the drive is a flow of data from the drive to the buffer, and in a write mode of the drive the drive rate F 520 is a flow of data from the buffer to the drive 506. This is shown by the data flow arrow 524 pointing towards the buffer in a read mode and the data flow arrow 526 pointing towards the drive in a write mode. Similarly, the data flow arrow 528 points from the buffer towards the application in a read mode and the arrow 520 points the other way in a write mode.
In a read mode of the optical drive normally a threshold 516 is provided as a lower limit in the buffer as shown at 516. In a write mode of the optical drive normally a threshold 518 is provided as an upper limit in the buffer. The optical drive system 502 may comprise devices such as devices for measuring an application drive rate and/or for measuring a temperature of certain parts of the drive in order to decide if thermal management is needed, means such as switches for starting and or stopping the drive etc. FIG. 6 is a flow diagram of a method of controlling the optical drive. In the step with reference number 606 the drive rate F is determined (Det. F) and in step 602 and 604 the application rate R is determined and the buffer size B is determined.
Hereafter the duty cycle ratio AND the maximum off duty time is determined in step 608. In step 610 the optical drive is operated in accordance with the determinations provided in step 608.
Although the present invention has been described in connection with preferred embodiments, it is not intended to be limited to the specific form set forth herein. Rather, the scope of the present invention is limited only by the accompanying claims. In this section, certain specific details of the disclosed embodiment such as the order of the determination of data rate and application rate, the control strategy of how to use the present invention etc., are set forth for purposes of explanation rather than limitation, so as to provide a clear and thorough understanding of the present invention. However, it should be understood readily by those skilled in this art, that the present invention may be practised in other embodiments which do not conform exactly to the details set forth herein, without departing significantly from the spirit and scope of this disclosure. Further, in this context, and for the purposes of brevity and clarity, detailed descriptions of well-known apparatus, circuits and methodology have been omitted so as to avoid unnecessary detail and possible confusion. Reference signs are included in the claims, however the inclusion of the reference signs is only for clarity reasons and should not be construed as limiting the scope of the claims.

Claims

CLAIMS:
1. A method of controlling the thermal management of an optical drive system (502), the optical drive system (502) comprising:
- an optical drive (504), (506) having a drive rate F (520) for reading and/or writing data from and/or to a media - a buffer (512) having a buffer size B for buffering data, wherein the buffer (512) is transferring data to an application (508) or receiving data from an application (510) at an application data rate R (522)
- a control logic (514) wherein the method comprises the steps of - determining the drive rate F (520)
- determining the application data rate R (522)
- determining a duty cycle ratio between the on duty cycle time and the total duty cycle time of the optical drive (504), (506) based on the application rate R (522) and the drive rate F (520) and - determining a maximum off duty time
- operating the optical drive (504), (506) in accordance with the determined duty cycle ratio and the maximum off duty time.
2. A method according to claim 1, wherein the determined duty cycle ratio is a minimum ratio that the optical drive (504), (506) is on duty.
3. A method according to claim 2, wherein the minimum is determined as the ratio comprising the time Tl and the time T2.
4. A method according to claim 1 , wherein a first threshold (516) is set so that a minimum of data is ensured in the buffer.
5. A method according to claim 1 , wherein a second threshold (518) is set so that a maximum of data is present in the buffer.
6. A method according to claim 4, wherein the duty cycle is determined so that it is ensured that a minimum of on duty time is set such as the amount of data in the buffer (512) is larger than or equal to the first threshold (516).
7. A method according to claim 5, wherein the duty cycle is determined so that it is ensured that a minimum of on duty time is set such as the amount of data in the buffer (512) is lower than or equal to the second threshold (518).
8. An optical drive system comprising
- an optical drive (504), (506) for reading and/or writing data from and/or to a media, the optical drive having a determined drive rate F (520)
- a buffer (512) having a buffer size B for buffering data, wherein the buffer (512) is transferring data to an application (508) or receiving data from an application (510) at an application data rate R (522) wherein the optical drive (504), (506) is adapted to operate in an on and off duty cycle ratio during thermal management, the ratio being determined based on R (522) and F (520) and the optical drive (504), (506) being adapted to operate in accordance with a maximum off duty time.
9. A control logic (514) for an optical drive system (502), the control logic being adapted to control the optical drive system in an on and off duty cycle during thermal management wherein the on and/or off duty cycle time is determined based on values comprising an optical drive rate F and an application rate R.
10. An optical data storage system including the control logic (514) according to claim 9.
11. Computer readable code adapted to perform the steps of claim 1.
PCT/IB2006/051498 2005-05-24 2006-05-12 Thermal management for optical drives with buffer memory WO2006126132A1 (en)

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