CN101350015A - Data storage system and access method thereof - Google Patents
Data storage system and access method thereof Download PDFInfo
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- CN101350015A CN101350015A CNA2007101358019A CN200710135801A CN101350015A CN 101350015 A CN101350015 A CN 101350015A CN A2007101358019 A CNA2007101358019 A CN A2007101358019A CN 200710135801 A CN200710135801 A CN 200710135801A CN 101350015 A CN101350015 A CN 101350015A
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Abstract
The invention provides a method for accessing a storage system. The storage system comprises a first file system, a second file system and an internal memory. The first file system can access the internal memory. The method comprises: judging an instruction is related with the first file system or the second file system by the method, sending the instruction to the first file system by the method if the instruction is related with the first file system, sending the instruction to the second file system by the method if the instruction is related with the second file system, and then judging whether the instruction is related with the internal memory or not by the method, and transforming the instruction into the instruction after transformation and returning to the step of judging the instruction is related with which file system if the instruction is related with the internal memory by the method. The instruction after transformation is related with the first file system and the internal memory.
Description
Technical field
The present invention relates to stocking system, relating in particular to can be by the stocking system of external electronic access and access method thereof.
Background technology
Storage type flash (NAND flash memory) and code-shaped flash memory (NOR flashmemory) are the basic specification of flash memory (flash memory).Development NOR flash memory early, reading speed is fast than nand flash memory at random for it, is mainly used in store program code, but because its capacity is less, writing speed is slow, therefore is not suitable for developing towards high capacity.
Each unit of nand flash memory (cell) is connected to each other, and only head and the tail Unit two link to each other with front (work line) and bit line (bit line) respectively.Relatively, in the NOR flash memory, each unit all links with front and bit line.In comparison, nand flash memory can have bigger storage volume.
Because nand flash memory has advantages such as the big and rewriting speed of storage volume is fast, therefore can be applicable to store mass data, for example as digital camera and the employed internal memory of MP3 walkman.Its storage volume can reach more than thousands of megabit groups at present.The multimedia application of hand-held device at present is quite flourishing, and the demand of related feasible storage audio/video file heightens.Therefore, the Related product kind of using nand flash memory in recent years also increases gradually, becomes the industry that attracts attention very much on the consumer electronics market.
In addition, another advantage of nand flash memory is between itself and the personal computer, and (Universal Serial Bus, USB) transmission line can carry out the transmission of file need only to converge current drainage by universal sequence.Because most of personal computers utilize file allocation table (FileAllocation Table, FAT) file system is communicated by letter with peripheral electronic installation, therefore the also necessary built-in FAT file system of electronic installation that comprises nand flash memory, ability and personal computer communication, and then the function of realization file transfer.
Be subject to the physical characteristics of nand flash memory, data write nand flash memory must remove the operation of (erase) to being written into section data earlier before.Generally speaking, nand flash memory is the unit of writing with 512 bytes, serves as to remove unit with the 2K byte.Yet, no matter be to the application program on upper strata or the entity hardware of lower floor, the read-write operation that it is unit that the FAT file system all can only provide with 512 bytes.
In addition, the FAT file system also can't cooperate the data processor that removing earlier writes again.Therefore, the electronic installation that comprises nand flash memory also must utilize the file conversion layer (FileTranslation Layer FTL) as the intermediary layer between FAT file system and the nand flash memory, satisfies both sides' read write attribute thus.
With reference to Fig. 1, Fig. 1 shows in the prior art, personal computer and comprise the synoptic diagram that carries out data transmission between the electronic installation of nand flash memory.As shown in Figure 1, electronic installation 2 is electrically connected to personal computer 1 by transmission line.Electronic installation 2 comprises FAT file system 2A, file conversion layer 2B and nand flash memory 2C.Though FAT file system 2A can communicate by letter with personal computer 1, can't meet the read-write demand of nand flash memory 2C.Therefore, also need file conversion layer 2B to be used as intermediary layer between nand flash memory 2C and the FAT file system 2A, could make and successfully transmit data between nand flash memory 2C and the personal computer 1.
Yet, in comprising the electronic installation of nand flash memory, increase this extra file conversion layer, not only expend a large amount of research and development time and cost, it is ageing that also possible delay product comes into the market.Therefore, fundamental purpose of the present invention is to provide a kind of stocking system and access method thereof, to address the above problem.
Summary of the invention
Be a kind of method of access stocking system according to a particular embodiment of the invention.This stocking system comprises first file system, second file system and first internal memory.This first internal memory can be by electronic installation with instruction accessing.Have the first internal memory driver in this first file system.But the data that store in this this first internal memory of first internal memory driver access.
In this embodiment, at first this method judges that this instruction is relevant with this first file system or relevant with this second file system.If this instruction is relevant with this first file system, then this method is sent to this first file system with this instruction.If this instruction is relevant with this second file system, then this method is sent to this second file system with this instruction.Then, this method judges whether this instruction is relevant with this first internal memory.If this instruction is relevant with this first internal memory, then this method is one to instruct after changing and get back to this instruction of above-mentioned judgement step relevant with this first file system or that be correlated with this second file system with this instruction transformation.This conversion back instruction is relevant with this first file system and this first internal memory.
Method according to access stocking system of the present invention, wherein, this instruction is relevant with this first file system to be meant this instruction character should the order format of first file system, and the relevant data address of this command request access that is meant with this first internal memory of this instruction is corresponding to this first internal memory.
According to the method for access stocking system of the present invention, wherein, this first file system be the recording flash file system (Journalling Flash File System, JFFS), this first internal memory driver is the flash drive program; And this saves as flash memory in first, but this this flash memory stores of flash drive program access is in the data of this particular address.
Method according to access stocking system of the present invention, wherein, this second file system is built-in allocation table operating system, this built-in allocation table operating system has file allocation table, if this instruction is relevant with this second file system and relevant with this first internal memory, then step then is sent to this instruction this second file system and also further comprises the following steps: the particular address of access that this instruction is desired is stored in this document allocation table if this instruction is relevant with this second file system.
According to the method for access stocking system of the present invention, wherein,, then this instruction is sent to the step of this first file system if this instruction is relevant with this first file system, comprise the following steps: further also to judge whether this instruction is relevant with this first internal memory; And, then operate this this first internal memory of first internal memory driver access if this instruction is relevant with this first file system and relevant with this first internal memory.
Method according to access stocking system of the present invention, wherein, this stocking system further comprises second internal memory that is disposed under this first file system, but this first internal memory driver is this second internal memory of access also, step is if this instruction is relevant with this first file system, then this instruction is sent to this first file system, comprise the following steps: further that also this instruction that is received as if this first file system is relevant with this first file system and relevant with this second internal memory, then operates this this second internal memory of first internal memory driver access.
Method according to access stocking system of the present invention, wherein, this stocking system further comprises the 3rd internal memory that is disposed under this second file system, but have the second internal memory driver access the 3rd internal memory in this second file system, step is if this instruction is relevant with this second file system, then this instruction is sent to this second file system, also further comprise the following steps: then to operate this second internal memory driver access the 3rd internal memory if this instruction is relevant with this second file system and be correlated with the 3rd internal memory.
According to an aspect of the present invention, provide a kind of stocking system, having comprised: first internal memory, this first internal memory can be by electronic installation with instruction accessing; First file system has the first internal memory driver in this first file system, but the data that store in this this first internal memory of first internal memory driver access; Second file system; And controller, this controller is electrically connected to this first file system and this second file system, and in order to judge that this instruction is relevant with this first file system or relevant with this second file system, if this instruction is relevant with this first file system, then this controller is sent to this first file system with this instruction, if this instruction is relevant with this second file system, then this controller is sent to this second file system with this instruction; Wherein, after receiving this instruction that this controller transmits, this second file system judges whether this instruction is relevant with this first internal memory, if this instruction is relevant with this first internal memory, then this second file system is a conversion back instruction with this instruction transformation and should change the back instruction and be sent to this controller, instructs relevant with this first file system and this first internal memory after this conversion.
According to stocking system of the present invention, wherein, this second file system is built-in allocation table operating system, this built-in allocation table operating system has file allocation table, if this instruction is relevant with this second file system and be correlated with this first internal memory, then this second file system will instruct desire access particular address be stored in this document allocation table.
According to stocking system of the present invention, wherein, if this instruction is relevant with this first file system, then this first file system judges whether this instruction is relevant with this first internal memory, if this instruction is relevant with this first file system and relevant with this first internal memory, then this this first internal memory of first internal memory driver access of this first file system operation.
According to stocking system of the present invention, further comprise: second internal memory, this second memory configurations are under this first file system, but also this second internal memory of access of this first internal memory driver; Wherein, this instruction that is received as if this first file system is relevant with this first file system and relevant with this second internal memory, then this this second internal memory of first internal memory driver access of this first file system operation.
According to stocking system of the present invention, further comprise: the 3rd internal memory, the 3rd memory configurations under this second file system, but have the second internal memory driver access the 3rd internal memory in this second file system; Wherein, if this instruction is relevant with this second file system and be correlated with the 3rd internal memory, this second internal memory driver access the 3rd internal memory of this second file system operation then.
Can be further understood by following detailed Description Of The Invention and appended accompanying drawing about the advantages and spirit of the present invention.
Description of drawings
Fig. 1 shows personal computer in the prior art and comprises the synoptic diagram that carries out data transmission between the electronic installation of nand flash memory.
Fig. 2 shows the process flow diagram according to the access method of first specific embodiment of the present invention.
Fig. 3 shows the process flow diagram of this method shown in Figure 2 when this stocking system further comprises second internal memory and the 3rd internal memory.
Fig. 4 shows the functional block diagram according to the stocking system of second specific embodiment of the present invention.
Fig. 5 shows the functional block diagram that stocking system shown in Figure 4 further comprises second internal memory and the 3rd internal memory.
Embodiment
According to stocking system of the present invention and access method thereof, utilizing originally can (Embedded File System EFS) communicates by letter with the FAT file system in order to the built-in file system of access nand flash memory.The situation that also needing between the nand flash memory and FAT file system in the prior art so can to avoid increasing an extra file conversion layer takes place.
The method that first specific embodiment according to the present invention is a kind of access stocking system.This stocking system comprises first file system, second file system and first internal memory.Wherein this first internal memory can be by electronic installation with instruction accessing.Have the first internal memory driver in this first file system, but and the data that store in this this first internal memory of first internal memory driver access.
For example, this stocking system may be arranged in the hand-held device of certain built-in nand flash memory.This nand flash memory that is the first above-mentioned internal memory.Accordingly, this first internal memory driver can be the flash drive program.This first file system can be former should hand-held device itself in order to recording flash file system or other built-in file system (EFS) of access nand flash memory.In order to communicate by letter with the electronic installation (for example personal computer) that adopts the FAT file system, this stocking system also comprises FAT file system (that is this second file system).
With reference to Fig. 2, Fig. 2 shows the process flow diagram of this method.As shown in Figure 2, in this embodiment, at first, this method execution in step S10 judges that the instruction that is sent to this stocking system is relevant with this first file system or relevant with this second file system.If the judged result of step S10 is relevant with this first file system for this instruction, then this method execution in step S14 is sent to this first file system with this instruction.
On the other hand, if the judged result of step S10 is relevant with this second file system for this instruction, then this method execution in step S11 is sent to this second file system with this instruction.Then, this method execution in step S12 judges whether this instruction is relevant with this first internal memory.If the judged result of step S12 is relevant with this first internal memory for this instruction, this method execution in step S13 then is to instruct after the conversion and get back to step S10 with this instruction transformation, wherein be somebody's turn to do instruct after changing relevant with this first file system and this first internal memory.
More particularly, the relevant order format of representing this instruction can meet this first file system of so-called this instruction with this first file system.Relevant this this first internal memory of command request access of then representing of this instruction with this first internal memory.
For example, if instruct when being judged as the order format that meets JFFS (first file system), then this instruction promptly is transferred into this JFFS.Relatively, if instruct when being judged as the order format that meets FAT file system (second file system), then this instruction promptly is transferred into this FAT file system.According to the above embodiments, if after this instruction is transferred into this FAT file system, further be judged as relevantly with this nand flash memory (first internal memory), then this instruction will be converted into a conversion back and instruct in step S13.
This conversion back instruction meets the order format of JFFS, and still relevant with this nand flash memory.Therefore, after the step S10 that is performed once more, this conversion back instruction will be transferred into this JFFS in step S14.In addition, if the judged result of step S12 has nothing to do for this instruction and this nand flash memory, but this method execution in step S20 then, to finish this determining program.
After step S14, this method can judge further whether this instruction is relevant with this first internal memory (that is this nand flash memory).If this judged result is for being that then this method can be operated this this first internal memory of first internal memory driver access.Thus, even the instruction that is sent to this stocking system by other device meets the order format of FAT file system, also can reach the purpose of this nand flash memory of access.
In actual applications, when this instruction was relevant with this first internal memory with this second file system, this method can be stored in the particular address of access that this instruction is desired in the file allocation table of this second file system.For example, if this instruction meets the order format of FAT file system and relevant with this first internal memory, this ad-hoc location of access that then this instruction is desired can be stored in the file allocation table of this FAT file system.
According to the present invention, above-mentioned stocking system can further comprise second internal memory that is disposed under this first file system.For example, can be comprised that the hand-held device of this stocking system also may keep the nand flash memory of another part by the nand flash memory of other electronic installation access, use for the operating system of hand-held device itself except above-mentioned.
In addition, above-mentioned stocking system also can further comprise the 3rd internal memory that is disposed under this second file system.For example, if this second file system is the FAT file system, then the 3rd internal memory can be the SD memory card that is connected to this stocking system.
With reference to Fig. 3, Fig. 3 shows the process flow diagram of this method when this stocking system further comprises second internal memory and the 3rd internal memory.In this example, this first internal memory and second internal memory belong to the internal memory (for example nand flash memory) of same type.Therefore, but the mentioned first internal memory driver in front except this first internal memory of access, but also this second internal memory of access.The 3rd internal memory then can by in this second file system the built-in second internal memory driver access.
As shown in Figure 3, after step S14, this method execution in step S17 judges that this instruction is relevant with this first internal memory or this second internal memory.If this instruction is relevant with this second internal memory, that is this second internal memory of this command request access, then this method is followed execution in step S15, operates this first internal memory driver with this second internal memory of access.On the other hand, if this instruction is relevant with this first internal memory, that is this first internal memory of this command request access, then this method is followed execution in step S19, operates this first internal memory driver with this first internal memory of access.
In addition, example shown in Figure 3 is with the step S12 among step S18 replacement Fig. 1.Step S18 is for judging that this instruction is relevant with this first internal memory or the 3rd internal memory.If this instruction is relevant with the 3rd internal memory, that is this command request access the 3rd internal memory, then this method gets final product execution in step S16, operates this second internal memory driver with access the 3rd internal memory.
But owing in this second file system, there is no this first internal memory driver of this first internal memory of access, therefore, if this instruction is relevant with this first internal memory, that is this first internal memory of this command request access, then this method is execution in step S13, is to instruct after the conversion and come back to step S10 with this instruction transformation.Because this conversion back instruction is relevant with this first file system and this first internal memory, therefore by above-mentioned steps as can be known, this method is operated this first internal memory driver with this first internal memory of access with execution in step S19 at last.
For instance, if instruction meets JFFS order format, then this instruction is transferred into this JFFS.If this command request access one flash memory, then the built-in flash drive program of this JFFS can be operated with this first internal memory of access or this second internal memory.In addition, if instruction meets the order format of FAT file system, and this command request access is by the SD memory card of FAT file-system access, then this FAT file system built-in SD memory card driver can be operated with this SD memory card of access.
With reference to Fig. 4, Fig. 4 is the stocking system that shows according to second specific embodiment of the present invention.As shown in Figure 4, stocking system 10 comprises first internal memory 11, first file system 12, second file system 13 and controller 14.First internal memory 11 can be by electronic installation with instruction accessing.Have the first internal memory driver in first file system 12.But the data that store in this this first internal memory of first internal memory driver access.Controller 14 is electrically connected to first file system 12 and second file system 13, and in order to judge that this instruction is relevant or relevant with second file system 13 with first file system 12.
Next, discuss at controller 14 issuable judged results.The judged result of supposing controller 14 is relevant with first file system 12 for this instruction, and then controller 14 is sent to first file system 12 with this instruction.On the other hand, suppose that the judged result of controller 14 is relevant with second file system 13 for this instruction, then controller 14 is sent to second file system 13 with this instruction.After receiving this instruction that controller 14 transmitted, second file system 13 judges whether this instruction is relevant with first internal memory 11.The judged result of supposing second file system 13 is relevant with first internal memory 11 for this instruction, then second file system 13 with this instruction transformation be a conversion back instruction and should change after instruct and be sent to controller 14.This conversion back instruction is relevant with first internal memory 11 with first file system 12.
In actual applications, because this conversion back instruction is relevant with first file system 12, therefore when controller 14 receives this conversion after after the instruction, promptly can judge instruct after this conversion relevant with first file system 12 and should change after instruct and be sent to first file system 12.
For example, first file system 12 may may may be nand flash memory for FAT file system, first internal memory 11 for JFFS, second file system 13, and this first internal memory driver then is the nand flash memory driver.Therefore, if instruction controlled device 14 judges that then this instruction is that controlled device 14 is sent to this JFFS when meeting the order format of JFFS.
Relatively, if instruction controlled device 14 judges that then this instruction is that controlled device 14 is sent to this FAT file system when meeting the order format of this FAT file system.Then, this instruction can this nand flash memory of access if judged by this FAT file system, and then this instruction will be instructed for after the conversion relevant with this nand flash memory with this JFFS by this FAT filesystem conversion.That is to say, but when this instruction meets FAT file system and access nand flash memory, but promptly can be converted into the order format that meets JFFS and the new instruction of access nand flash memory.Afterwards, this new instruction judgement and controlled device 14 of accepting controller 14 once more is judged as the order format that meets JFFS.Therefore, this new instruction promptly is transferred into this JFFS.
In addition, suppose that this instruction is relevant and relevant with first internal memory 11 with second file system 13, then second file system 13 can be stored in the particular address of access that this instruction is desired in this document allocation table.
On the other hand, if this instruction is relevant with first file system 12, then first file system 12 will judge whether this instruction is relevant with first internal memory 11.If the judged result of first file system 12 is for being that then first file system 12 is operated these first internal memory drivers with access first internal memory 11.For instance, presumptive instruction meets the order format of JFFS and requires the access flash memory, and then the flash drive program can be operated with this flash memory of access.
As shown in Figure 5, in fact stocking system 10 can further comprise second internal memory 15.Second internal memory 15 is configurable under first file system 12.But this first internal memory driver is access second internal memory 15 also.Suppose that this instruction that first file system 12 received is relevant and relevant with second internal memory 15 with first file system 12, then first file system, 12 these first internal memory driver access, second internal memories 15 of operation.For instance, if this instruction meets the order format of JFFS and requires access one flash memory, then this JFFS built-in flash drive program can be operated with this flash memory of access.
In addition, Fig. 5 shows simultaneously that also stocking system 10 can further comprise the 3rd internal memory 16.The 3rd internal memory 16 is disposed under second file system 13.But have the second internal memory driver access the 3rd internal memory 16 in second file system 13.If this instruction is relevant with the 3rd internal memory 16 with second file system 13, then second file system, 13 these second internal memory drivers of operation are with access the 3rd internal memory 16.That is to say that presumptive instruction meets the order format of FAT file system and this command request access configuration in the SD of FAT file system memory card, then this FAT file system built-in SD memory card driver can be operated with this SD memory card of access.
Compared with prior art, can utilize script to communicate by letter with the FAT file system according to this stocking system of the present invention and access method thereof in order to the EFS file system of access flash memory, therefore can solve needs the problems that increase by a file conversion layer as intermediary layer traditionally, and then reaches the effect of supporting EFS file system and FAT file system simultaneously.Thus, not only can save research and development time and cost, also speed ageing that product comes into the market according to this stocking system of the present invention and access method thereof.
By the detailed description of above preferred specific embodiment, hope can be known description feature of the present invention and spirit more, and is not to come scope of the present invention is limited with above-mentioned disclosed preferred specific embodiment.On the contrary, its objective is that hope can contain various changes and be equal to replacement in the scope of the claim of institute of the present invention desire protection.Therefore, the scope of the present invention's claim required for protection should be done the broadest explanation according to above-mentioned explanation, so that it is contained all possible change and is equal to replacement.
The primary clustering symbol description
S10～S20: process step 10: stocking system
12: the first file system of 11: the first internal memories
16: the three internal memories of 15: the second internal memories
Claims (10)
1. the method for an access stocking system, described stocking system comprises first file system, second file system and first internal memory, described first internal memory can be by electronic installation with an instruction accessing, have the first internal memory driver in described first file system, but the data that store in described first internal memory of the described first internal memory driver access, described method comprises the following steps:
(a) judge that described instruction is relevant with described first file system or relevant with described second file system;
(b) if described instruction is relevant with described first file system, then described instruction is sent to described first file system; And
(c) if described instruction is relevant with described second file system, then described instruction is sent to described second file system, and carries out the following step:
(c1) judge whether described instruction is relevant with described first internal memory; And
(c2) if described instruction is relevant with described first internal memory, then be to instruct after the conversion and get back to step (a) with described instruction transformation, wherein said conversion is afterwards instructed relevant with described first file system and described first internal memory.
2. method according to claim 1, wherein, described instruction is relevant with described first file system to be meant that described instruction meets the order format of described first file system.
3. method according to claim 1, wherein, the relevant data address of described command request access that is meant with described first internal memory of described instruction is corresponding to described first internal memory.
4. method according to claim 1, wherein, described first file system is the recording flash file system, the described first internal memory driver is the flash drive program.
5. method according to claim 4 wherein, save as flash memory in described first, but the described flash memory stores of described flash drive program access is in the data of described particular address.
6. method according to claim 1, wherein, described second file system is built-in allocation table operating system, described built-in allocation table operating system has file allocation table, relevant with described second file system and relevant with described first internal memory as if described instruction, then step (c) also further comprises the following steps:
(c3) particular address with access that described instruction is desired is stored in the described file allocation table.
7. method according to claim 1, wherein, if described instruction is relevant with described first file system, then step (b) also further comprises the following steps:
(b1) judge whether described instruction is relevant with described first internal memory; And
(b2) relevant with described first file system and relevant as if described instruction with described first internal memory, then operate described first internal memory of the described first internal memory driver access.
8. method according to claim 7, wherein, described stocking system further comprises second internal memory that is disposed under described first file system, but also described second internal memory of access of the described first internal memory driver, step (b) also further comprises the following steps:
(b3) the described instruction that is received as if described first file system is relevant with described first file system and relevant with described second internal memory, then operates described second internal memory of the described first internal memory driver access.
9. method according to claim 1, wherein, described stocking system further comprises the 3rd internal memory that is disposed under described second file system, but has described the 3rd internal memory of the second internal memory driver access in described second file system, and step (c) also further comprises the following steps:
(c4) relevant with described second file system and relevant as if described instruction with described the 3rd internal memory, then operate described the 3rd internal memory of the described second internal memory driver access.
10. stocking system comprises:
First internal memory, described first internal memory can be by electronic installation with instruction accessing;
First file system has the first internal memory driver in described first file system, but the data that store in described first internal memory of the described first internal memory driver access;
Second file system; And
Controller, described controller is electrically connected to described first file system and described second file system, and in order to judge that described instruction is relevant with described first file system or relevant with described second file system, if described instruction is relevant with described first file system, then described controller is sent to described first file system with described instruction, if described instruction is relevant with described second file system, then described controller is sent to described second file system with described instruction;
Wherein, after receiving the described instruction that described controller transmits, described second file system judges whether described instruction is relevant with described first internal memory, if described instruction is relevant with described first internal memory, then described second file system is a conversion back instruction with described instruction transformation and described conversion back instruction is sent to described controller, instructs relevant with described first file system and described first internal memory after the described conversion.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101358019A CN101350015A (en) | 2007-07-16 | 2007-07-16 | Data storage system and access method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2007101358019A CN101350015A (en) | 2007-07-16 | 2007-07-16 | Data storage system and access method thereof |
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| CNA2007101358019A Pending CN101350015A (en) | 2007-07-16 | 2007-07-16 | Data storage system and access method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102467920A (en) * | 2010-11-10 | 2012-05-23 | 日立-Lg数据存储韩国公司 | Optical disc drive capable of changing mode and method for changing mode in the same |
| CN103106042B (en) * | 2011-11-14 | 2016-07-06 | 联想(北京)有限公司 | Data access method and electronic equipment |
-
2007
- 2007-07-16 CN CNA2007101358019A patent/CN101350015A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102467920A (en) * | 2010-11-10 | 2012-05-23 | 日立-Lg数据存储韩国公司 | Optical disc drive capable of changing mode and method for changing mode in the same |
| CN103106042B (en) * | 2011-11-14 | 2016-07-06 | 联想(北京)有限公司 | Data access method and electronic equipment |
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