JP2007052914A - Disk driving apparatus, and loading control method of recording disk - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disk driving apparatus capable of shortening response time when reading and writing a data before and after taking out and inserting the same recording disk. <P>SOLUTION: When loading a recording disk, the disk driving apparatus reads medium identification information of the recording disk by a medium kind acquisition part 21 and stores the information in memory 26, and also it is judged by a judging part 22 whether or not the medium identification information read and acquired this time is different from that read and acquired last time. When there is a difference in the medium identification information between this time and last time, a memory control part reads DMA information from the recording disk, and the DMA information is rewritten on the DMA information read and stored in the memory 26 last time, and when there is no difference in the medium identification information between this time and last time, the DMA information is not read from the recording disk, but the DMA information read and stored in the memory 26 last time is held. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a disk drive device for loading a recording disk such as a portable magneto-optical disk, and a recording disk loading control method therefor.

  Recent magneto-optical disks tend to increase the number of allowable defective sectors as the capacity increases. Therefore, DMA (Defect Management Areas) information indicating a list of addresses of defective sectors in the magneto-optical disk is also enlarged, and there is a tendency that a long time is required for loading (initial insertion operation) of the magneto-optical disk. For example, a 1.3 GB magneto-optical disk requires about 12 seconds for loading. In the future, it is expected that the capacity of the magneto-optical disk will increase and the loading time will become longer. For this reason, there is a demand for a technique for quickly completing loading and reducing the time required for the loading.

  As shown in FIG. 8, in the conventional disk drive device A10, when loading the magneto-optical disk B10, the CPU 110 reads the control track B11 of the magneto-optical disk B10 and acquires the type of the disk.

  If the type is known, the CPU 110 obtains the physical address on the magneto-optical disk B10 on which the DMA information B12 is recorded. Then, the CPU 110 outputs two pieces of DMA information B12 recorded in total in the outermost zone and the innermost zone near the both ends of the recording area B13 on the magneto-optical disk B10, from the inner side to the outer side. Are sequentially read and stored in the DMA information storage area 120D of the RAM 120 serving as a buffer memory.

  Here, the DMA information B12 includes a PDL (Primary Defect List) and an SDL (Secondary Defect List), in which an address list of defective sectors on the magneto-optical disk B10 is recorded.

  Specifically, PDL will be described. As shown in FIG. 10 in comparison with FIG. 9, when a defective sector is detected in a zone at the time of physical formatting of the magneto-optical disk B10, the defective data is skipped and initialization data is transferred. To be recorded. Then, the zone where the defective sector exists is expanded to the spare zone where the replacement sector exists so as to have the original number of sectors, and the address of the defective sector is recorded in the DMA information B12. A defect that can be addressed by skipping a defective sector is called a first defect, and a set of addresses of defective sectors corresponding to the first defect is called a PDL.

  As for SDL, as shown in FIG. 11 as compared with FIG. 9, when a defective sector is detected in a certain zone at the time of data writing, data is recorded in the sector of the spare zone instead of the defective sector. . Then, the address of the defective sector and the address of the replacement sector are recorded in the DMA information B12. In this way, a defect that can designate a replacement sector by address conversion is called a second defect, and a set of addresses of defective sectors corresponding to the second defect is called an SDL.

  When loading the magneto-optical disk B10, it is necessary to convert the logical address instructed by the host C10 into a physical address, so it is necessary to read the DMA information B12. In this case, in order to verify the validity of the DMA information B12, all four pieces of DMA information B12 must be read. The reason for this is that when data is written to the magneto-optical disk B10, the contents of the DMA information B12 are originally updated when the second defect occurs and the power supply is stopped while the sector replacement process is being performed. This is because the DMA information B12 may end abnormally without being completely updated, and the contents of the DMA information B12 may be different from each other, and it is necessary to employ the DMA information B12 having the highest reliability.

  After loading as described above, the CPU 110 of the disk drive device A10 corresponds to the access command from the host C10 and performs address conversion while referring to the PDL and SDL included in the read DMA information B12. Data is read from and written to the magneto-optical disk B10.

  In particular, when data is read from the recording area B13 of the magneto-optical disk B10, the data is transferred via the cache area 120C of the RAM 120, and the data copied to the cache area 120C overflows in the cache area 120C. Will continue to be held. When data read is instructed from the host C10 by designating the same address, the CPU 110 does not need to control the seek operation involving mechanical head movement, and the data in the cache area 120C is directly transferred to the host C10. Can be transferred.

  Thereafter, when unloading (ejection completion operation) for ejecting the magneto-optical disk B10 from the disk drive device A10 in response to an eject key operation or a take-out command from the host C10, it remains in the cache area 120C at that time. Data is invalidated.

  Here, when the same magneto-optical disk B10 as before is inserted into the disk drive device A10, even if the DMA information B12 is the same, the CPU 110 performs four DMA operations from the top of the magneto-optical disk B10 as the loading operation. The operation of reading information B12 was always performed.

  Even if data remains in the cache area 120C after unloading, the data is invalidated. When the same magneto-optical disk B10 as before is inserted into the disk drive A10 and loading is performed again, the CPU 110 Data was newly read from the magneto-optical disk B10 while controlling the seek operation, and the data was transferred to the host C10 via the cache area 120C.

  By the way, when using the apparatus, after the user ejects one magneto-optical disk B10 from the state inserted in the disk drive apparatus A10, loading is performed by inserting the same magneto-optical disk B10 into the disk drive apparatus A10 again. Often repeated.

  For example, for the magneto-optical disk B10 inserted in the disk drive device A10, the user can check the contents of the sticker attached to the label surface of the magneto-optical disk B10, put a sticker on the label surface, The above-described operation is performed when a note is added to the.

  Immediately after the important data is written to the magneto-optical disk B10, the user can use a write-protect switch for prohibiting writing provided on the hard cover of the magneto-optical disk B10 in order to prevent the data from being accidentally destroyed. In this case, it is the same as described above.

  However, even if a command requesting data access is sent from the host C10 to the disk drive device A10 during the second loading by inserting / removing the same magneto-optical disk B10, the CPU 110 does not change the PDL, SDL until the loading is completed. Cannot be acquired, and a logical address designated with data access cannot be converted into a physical address. Therefore, the CPU 110 needs to wait for the access operation according to the command until the loading is completed, and there is a problem that the response to the host C10 is delayed. The time required for this response becomes longer as the capacity of the magneto-optical disk B10 increases.

  At the time of the second loading, data copied from the same magneto-optical disk B10 remains in the cache area 120C of the RAM 120, and the probability of hitting the data is high. Nevertheless, at the time of the second loading, all the data remaining in the cache area 120C is invalidated by the unloading performed immediately before that. For this reason, when there is a command for requesting data reading from the host C10 after the second loading is completed, the CPU 110 cannot hit the data in the cache area 120C, which involves a mechanical head movement. A seek operation must be performed. Accordingly, there has been a problem that the notification of the completion of the command related to data reading to the host C10 is delayed, and the response to the host C10 is delayed.

  Therefore, as described at the beginning, an object of the present invention is to reduce the loading time of the recording disk. Overall and specifically, the data is recorded before and after the same recording disk is inserted and removed. An object of the present invention is to provide a disk drive device capable of reducing the response time when reading and writing, and a recording disk loading control method therefor.

  According to the first aspect of the present invention, the medium identification information inherently held by the recording disk is read when the recording disk is loaded, and the DMA information in which a list of defective addresses is read and stored in the memory, A disk drive device that transfers data between a recording disk and a host while performing address conversion with reference to the DMA information, and the medium identification obtained by reading this time stored in the memory when the recording disk is loaded When the determination unit that determines whether or not the information and the medium identification information obtained by reading the previous time are different and the determination unit obtains a determination result that the current medium identification information and the previous medium identification information are different are recorded The DMA information is read from the disk, and the DMA information stored in the memory is input to the previously read DMA information. And a memory control unit that prohibits reading of DMA information from the recording disk when the determination result that the current medium identification information and the previous medium identification information are the same is obtained. A disk drive device is provided.

  According to the second aspect of the present invention, the medium identification information inherently held by the recording disk is read when the recording disk is loaded, and when the host is instructed to read the data, the data is read from the recording disk. A disk drive device that temporarily stores data in a cache memory and then transfers it to a host. The medium identification information obtained by reading this time and the medium identification information obtained by reading the previous time are stored in the memory when the recording disk is loaded. When the determination unit that determines whether or not the current medium identification information is different from the previous medium identification information is obtained by the determination unit, the contents of the cache memory are erased, and the determination unit When the determination result that the medium identification information and the previous medium identification information are the same is obtained, the contents of the cache memory are retained. When the memory control unit and the host are instructed to read data, the determination unit determines whether the data exists in the cache memory, and determines that the data instructed to be read by the determination unit exists in the cache memory. Then, the reading of the data from the recording disk is prohibited and the data is read from the cache memory and transferred to the host. When the determination unit determines that there is no data instructed to be read from the cache memory, the data is read from the recording disk. There is provided a disk drive device comprising a data read control unit that reads the data, temporarily stores it in a cache memory, and then transfers the data to a host.

  According to the third aspect of the present invention, the medium identification information inherently held by the recording disk is read when the recording disk is loaded, and the DMA information in which a list of defective addresses is read and stored in the memory. A recording disk loading control method for transferring data between a recording disk and a host while performing address conversion with reference to the DMA information, and this time reading stored in a memory when the recording disk is loaded. A determination step for determining whether or not the medium identification information obtained in the previous step is different from the medium identification information obtained in the previous reading, and a determination result that the current medium identification information and the previous medium identification information are different from each other by the determination step. If obtained, the DMA information is read from the recording disk and the DMA information is stored in the memory. If the determination result that the current medium identification information and the previous medium identification information are the same is obtained by the determination step, reading of the DMA information from the recording disk is prohibited. And a memory control step. A recording disk loading control method is provided.

  According to the fourth aspect of the present invention, the medium identification information inherently held by the recording disk is read when the recording disk is loaded, and when the host is instructed to read the data, the data is read from the recording disk. A recording disk loading control method for transferring data to a host once stored in a cache memory, the medium identification information obtained this time stored in the memory when the recording disk was loaded, and the previous reading The determination step for determining whether or not the obtained medium identification information is different, and if the determination step obtains a determination result that the current medium identification information and the previous medium identification information are different, erases the contents of the cache memory. In the determination step, the determination result that the current medium identification information and the previous medium identification information are the same If obtained, the memory control step for holding the contents of the cache memory, the determination step for determining whether or not the data exists in the cache memory when the host instructs to read the data, and the determination step, When it is determined that the data instructed to be read exists in the cache memory, reading of the data from the recording disk is prohibited, the data is read from the cache memory and transferred to the host, and the data instructed to be read exists in the cache memory. And a data reading control step of reading the data from the recording disk and temporarily storing the data in the cache memory and then transferring the data to the host. .

  According to the present invention, the DMA information is read from the recording disk by a new loading or the previous data remaining in the cache memory is invalidated only when the recording disk is replaced with another one. .

  That is, conversely, when the same recording disk is actually inserted / removed, the previous DMA information remaining in the memory is used without being replaced, or the previous data remaining in the cache memory is still valid. It is done.

  Therefore, when reading / writing data after inserting / removing the same recording disk, the process of reading the DMA information of the recording disk at the time of the second loading is omitted, so that the loading time is compared with the first time. Even if an instruction to read / write data is given immediately after the second insertion, the response time for data transfer with the host can be shortened. Similarly, when data is read out after inserting and removing the same recording disk, the previous data remaining in the cache memory can be used as it is even after the second loading, so the data is read out from the second recording disk. At this time, the probability of hitting data in the cache memory is increased, and the response time when the host is instructed to read data can be shortened.

  Various other features and advantages of the present invention will become apparent from the embodiments described below with reference to the accompanying drawings.

  A first embodiment of the present invention will be described below with reference to FIGS. Since the first embodiment is not physically different from the conventional configuration, the description of the same parts as those in the conventional example shown in FIG. 8 is omitted as much as possible.

  In the first embodiment of the present invention, as shown in FIG. 1, a disk drive device A having a loading function, a magneto-optical disk B as a recording disk, and a personal computer C as a host instructing reading / writing of data are used. It is done. Note that the personal computer C operates based on an OS (Operating System) having a file management function and has essentially no features, and thus detailed illustration and explanation thereof is omitted.

  First, the magneto-optical disk B to be loaded will be described. As this type of magneto-optical disk B, for example, an MO (Magneto Optical disk) is used. By capacity, for example, there are 230 MB, 540 MB, 640 MB, and 1.3 GB. The magneto-optical disk B has a large number of tracks (not shown) as a recording area B3 for recording data. Viewed conceptually, the magneto-optical disk B has a large number of subdivided sectors as unit recording areas. In general, for example, in a 640 MB magneto-optical disk, the recording area is divided into 11 zones from the inner circumference side to the outer circumference side, and in a 1.3 GB magneto-optical disk, 18 zones are given from the outer circumference side to the inner circumference side. Divided into zones. Actually, the track is often formed in a spiral shape.

  Looking at the recording surface of the magneto-optical disk B, a total of four pieces of DMA information B2 are recorded in each of the areas outside the outermost zone and inside the innermost zone of the recording area B3. . The DMA information B2 includes the above-described PDL and SDL, and a list of addresses of defective sectors on the recording area B3 of the magneto-optical disk B is recorded. When accessing the magneto-optical disk B, the control track B1 on the lead-in side is first read, and medium identification information (not shown) is recorded in the vicinity of the control track B1. The medium identification information includes unique information for identifying the magneto-optical disk B itself and distinguishing it from others, and the number of data updates. The unique information is written only once at the time of formatting the magneto-optical disk B or before shipping the product. The number of data updates is the magneto-optical disk to be described later after the data in the recording area B3 is updated. It is counted up when B is unloaded.

  As shown in FIG. 1, the disk drive apparatus A includes a control unit 1, an optical head 2, a magnetic head 3, and a motor drive circuit 4. The control unit 1 includes a CPU 11, a RAM 12, a ROM 13, and an interface circuit 14, and the CPU 11, the RAM 12, the ROM 13, and the interface circuit 14 are connected to each other by a bus line 15. The bus line 15 includes a data bus, an address bus, and a control signal line.

  The disk drive device A writes data to the magneto-optical disk B or reads data from the magneto-optical disk B in response to a data access request such as data writing or reading from the personal computer C. A magneto-optical disk B is inserted into the disk drive device A. A series of initial operations accompanying this insertion is called loading. A series of completion operations for ejecting the magneto-optical disk B from the disk drive device A is called unloading. These operations will be described in detail later.

  The control unit 1 controls the optical head 2, the magnetic head 3, and the motor drive circuit 4 based on instructions from the personal computer C. The optical head 2 and the magnetic head 3 are controlled by the control unit 1 to access a unit recording area (sector) of the magneto-optical disk B. The motor drive circuit 4 is controlled by the control unit 1 to insert and eject a motor for rotating the magneto-optical disk B, a motor for moving the optical head 2 and the magnetic head 3, and the magneto-optical disk B. Sometimes drives a motor to slide. Each motor may be independent or shared.

  The CPU 11 controls the entire control unit 1. The RAM 12 provides a work area 12W for storing various data and information in the CPU 11. In addition to the work area 12W, the RAM 12 has a DMA information storage area 12D for storing DMA information and a cache area 12C for exchanging data with the personal computer C at high speed. Yes. The ROM 13 stores a program for operating the CPU 11.

  When this control unit 1 is represented by a functional block, as shown in FIG. 2, the control unit 1 includes a medium type acquisition unit 21, a determination unit 22, an address conversion unit 23, a data read / write unit 24, a memory control unit 25, and a memory 26. . Specifically, the CPU 11 implements a medium type acquisition unit 21, a determination unit 22, an address conversion unit 23, a data read / write unit 24, and a memory control unit 25. The RAM 12 implements the memory 26.

  The medium type acquisition unit 21 reads the medium identification information when loading the magneto-optical disk B, and identifies the magneto-optical disk B based on the unique information included therein.

  When the magneto-optical disk B is loaded, the determination unit 22 determines whether or not the magneto-optical disk B at that time is different from the previously inserted magneto-optical disk based on the medium identification information. In other words, until the medium identification information is read from the current magneto-optical disk B, the determination unit 22 keeps the medium identification information for the previous time as it is in the RAM 12. This previous medium identification information is medium identification information used from the previous loading to unloading.

  When the magneto-optical disk B is loaded, the address conversion unit 23 reads the DMA information B2 and stores it in the DMA information storage area 12D of the RAM 12. On the other hand, when the personal computer C designates a logical address and instructs to read / write data, A physical address is obtained by referring to the DMA information B2. Here, the DMA information B2 stored in the DMA information storage area 12D remains in the DMA information storage area 12D at least until the next loading.

  The data read / write unit 24 reads / writes data and information using the physical address obtained by the address conversion unit 23 as a clue. Here, the data read from the magneto-optical disk B is copied to the cache area 12C of the RAM 12 and transferred to the personal computer C via the cache area 12C. However, if the data to be read already exists in the cache area 12C, the data read / write unit 24 transfers the corresponding data directly from the cache area 12C to the personal computer C without controlling the seek operation that involves the movement of the mechanical head. And forward. On the other hand, when data is updated by reading / writing data on the magneto-optical disk B, the data read / write unit 24 rewrites the number of data updates when unloading the magneto-optical disk B, and includes this in the medium identification information. Write to magnetic disk B.

  When the determination unit 22 determines that the medium identification information is different between the current time and the previous time, the memory control unit 25 causes the address conversion unit 23 to read the DMA information B2 at the current loading stage, and is obtained at that time. The DMA information B2 is replaced with the previous DMA information remaining in the DMA information storage area 12D of the RAM 12. On the other hand, when the determination unit 22 determines that the medium identification information is the same at the current time and the previous time, the memory control unit 25 does not cause the address conversion unit 23 to read the DMA information B2 at the current loading stage. The previous DMA information B2 remaining in the DMA information storage area 12D at that time can be used as it is.

  Further, when the determination unit 22 determines that the medium identification information is different between the current time and the previous time, the memory control unit 25 invalidates the data remaining in the cache area 12C of the RAM 12 at the current loading stage, The contents of area 12C are erased. On the other hand, if the determination unit 22 determines that the medium identification information is the same at the current time and the previous time, the memory control unit 25 validates the data remaining in the cache area 12C of the RAM 12 at the current loading stage. It can be used as it is.

  Next, the operation from loading to unloading of the magneto-optical disk will be described with reference to the flowcharts of FIGS.

  First, when the magneto-optical disk B is inserted into the disk drive device A (S10: YES), the CPU 11 starts reading from the control track B1 of the magneto-optical disk B, reads the medium identification information, and stores it in the RAM 12 (S11). . The medium identification information obtained at this time is stored in the RAM 12 separately from the medium identification information obtained at the previous reading. When the magneto-optical disk B is not inserted into the disk drive A (S10: NO), the CPU 11 keeps the state until the magneto-optical disk B is inserted.

  The CPU 11 determines whether or not the medium identification information read at the present time is the same as the medium identification information read in the previous time and left in the RAM 12 (S12). At this time, not only the unique information included in the medium identification information but also the number of data updates is used as a comparison target in order to determine whether or not they completely match.

  When the medium identification information is different between the current time and the previous time (S12: NO), the CPU 11 erases the contents stored in the RAM 12 (S13). At this time, the medium identification information obtained at the present time is excluded from the objects to be erased and stored in the RAM 12 as it is, while the contents of the DMA information storage area 12D and the cache area 12C are erased.

  Subsequently, the CPU 11 obtains the address of the DMA information B2 from the medium identification information, reads all four DMA information B2 based on the obtained address, and stores it in the DMA information storage area 12D of the RAM 12 (S14). ). The operation up to this point after inserting the magneto-optical disk B is loading.

  After the preparation for reading / writing data is completed as described above, when there is an instruction to read / write data from the personal computer C (S15: YES), the CPU 11 determines whether the instruction content is an instruction to read data. Judgment is made (S16).

  When the instruction is a data reading instruction (S16: YES), the CPU 11 obtains an arrangement location of data to be read by address conversion while referring to the DMA information B2 stored in the DMA information storage area 12D (S17). Data is read from the place and transferred to the personal computer C (S18). Note that when transferring data, the cache area 12C of the RAM 12 is used. If previously read data remains in the cache area 12C, the data in the cache area 12C is directly transferred.

  Then, the CPU 11 determines whether or not the ejection of the magneto-optical disk B is instructed in response to the operation of the eject key or the take-out command from the personal computer C (S19).

  When ejection of the magneto-optical disk B is instructed (S19: YES), the CPU 11 determines whether or not data has been updated by writing data to the magneto-optical disk B before starting the ejection operation (S20). .

  When the data has been updated (S20: YES), the CPU 11 rewrites the medium identification information located on the RAM 12 and the magneto-optical disk B in order to change the number of data updates (S21).

  Thereafter, the CPU 11 finally starts the ejection operation, ejects the magneto-optical disk B (S22), and finishes the entire process. The operation so far after the ejection of the magneto-optical disk B is instructed is unloading.

  If there is no data update in S20 (S20: NO), the CPU 11 proceeds to S22 without rewriting the medium identification information.

  If the ejection of the magneto-optical disk B is not instructed in S19 (S19: NO), the CPU 11 returns to S15.

  If it is a data write instruction in S16 (S16: NO), the CPU 11 obtains an arrangement location of data to be written by address conversion while referring to the DMA information B2 stored in the DMA information storage area 12D (S23). Then, the data transferred from the personal computer C is written in the arrangement location (S24). Thereafter, the CPU 11 proceeds to S19.

  In S15, when there is no instruction to read / write data from the personal computer C (S15: NO), the CPU 11 proceeds to S19.

  In S12, when the medium identification information matches between the current time and the previous time (S12: YES), the CPU 11 maintains the current state of all the contents stored in the RAM 12 (S30) as shown in FIG. The previous DMA information remaining in the information storage area 12D can be used for address conversion (S31). In other words, when the same magneto-optical disk B is inserted and removed, the operation of reading the DMA information from the magneto-optical disk B inserted for the second time is omitted, and the previously obtained DMA information is used again. The cache area 12C of the RAM 12 is also in a state where the previous data is left as it is. In addition, various parameter information relating to the magneto-optical disk B is also left in the RAM 12.

  Thereafter, when there is an instruction to read / write data from the personal computer C (S32: YES), the CPU 11 determines whether the instruction content is an instruction to read data (S33).

  When it is a data reading instruction (S33: YES), the CPU 11 determines whether or not the instructed data exists in the cache area 12C (S34), and when it exists (S34: YES), the cache area 12C. Is directly transferred to the personal computer C (S35). Thereafter, the CPU 11 proceeds to S19.

  If the instructed data does not exist in the cache area 12C in S34 (S34: NO), the CPU 11 refers to the DMA information B2 stored in the DMA information storage area 12D, and places the data to be read by address conversion (S36), data is read from the arrangement location and transferred to the personal computer C (S37). Thereafter, the CPU 11 proceeds to S19.

  If it is a data write instruction in S33 (S33: NO), the CPU 11 obtains the location of data to be written by address conversion while referring to the DMA information B2 stored in the DMA information storage area 12D (S38). The data transferred from the personal computer C is written in the arrangement location (S39). Thereafter, the CPU 11 proceeds to S19.

  In S32, when there is no instruction to read / write data from the personal computer C (S32: NO), the CPU 11 proceeds to S19.

  Therefore, according to the first embodiment, after the magneto-optical disk B is ejected, when the same magneto-optical disk B is inserted again to read / write data, the second loading is performed on the magneto-optical disk B. At this time, the process of reading the DMA information B2 is omitted. As a result, the time required for loading is shortened compared to the first time, and even if data read / write is instructed immediately after the second magneto-optical disk B is inserted, there is no seek operation and the personal computer C is not connected. Data transfer can be started immediately, and the response time at that time can be shortened.

  Similarly, when the same magneto-optical disk B is inserted / removed, the previous data remaining in the cache area 12C can be used as it is even after the second loading, so the data is read from the second magneto-optical disk B. At this time, the probability of hitting data in the cache area 12C is increased, and the response time when data reading is requested from the personal computer C can be shortened.

  Next, a second embodiment will be described with reference to FIGS. Note that the second embodiment is also physically the same as the first embodiment, and therefore, the description of the overlapping parts using FIG. 1 is omitted.

  In the second embodiment, as shown in FIG. 5, the control unit 1 includes a medium type acquisition unit 31, a timer unit 32, a determination unit 33, an address conversion unit 34, a data read / write unit 35, a memory control unit 36, and a memory. 37. Specifically, the CPU 11 implements a medium type acquisition unit 31, a timer unit 32, a determination unit 33, an address conversion unit 34, a data read / write unit 35, and a memory control unit 36. The RAM 12 implements the memory 37.

  The medium type acquisition unit 31, the address conversion unit 34, and the data read / write unit 35 have the same functions as those in the first embodiment.

  The timer unit 32 measures the disk replacement time from when the magneto-optical disk is ejected until the next magneto-optical disk is inserted.

  The determination unit 33 determines whether or not the disk replacement time measured by the timer unit 32 is longer than a preset reference time when the magneto-optical disk B is loaded. This reference time is a time of about several seconds during which the magneto-optical disk B cannot be replaced with another one.

  When the determination unit 33 determines that the disc replacement time is longer than the reference time, the memory control unit 36 causes the address conversion unit 34 to read the DMA information B2 at the current loading stage and is obtained at that time. The DMA information B2 is replaced with the previous DMA information remaining in the DMA information storage area 12D of the RAM 12. On the other hand, when the determination unit 33 determines that the disc replacement time is shorter than the reference time, the memory control unit 36 does not cause the address conversion unit 34 to read the DMA information B2 at the current loading stage, and Thus, the previous DMA information B2 remaining in the DMA information storage area 12D can be used as it is.

  If the determination unit 33 determines that the disc replacement time is longer than the reference time, the memory control unit 36 invalidates the data remaining in the cache area 12C of the RAM 12 at the current loading stage, and Erase the contents of 12C. On the other hand, when the determination unit 33 determines that the disc replacement time is shorter than the reference time, the memory control unit 36 validates the data remaining in the cache area 12C of the RAM 12 at the current loading stage and continues as it is. Can be used.

  Next, operations from loading to unloading of the magneto-optical disk will be described with reference to the flowcharts of FIGS. 6 and 7 will be described with a focus on differences from FIG. 3 and FIG.

  After the medium identification information is read from the magneto-optical disk B and stored in the RAM 12 in S11, the CPU 11 calculates a disk replacement time (S50). As will be described later, this disk replacement time is a time measured by the timer until the magneto-optical disk B is inserted after the timer is started when the magneto-optical disk B is ejected.

  Then, the CPU 11 determines whether or not the disc replacement time is shorter than a preset reference time (S51).

  When the disc replacement time is longer than the reference time (S51: NO), the CPU 11 erases the contents stored in the RAM 12 (S13). At this time, the medium identification information obtained at the present time is excluded from the objects to be erased and stored in the RAM 12 as it is, while the contents of the DMA information storage area 12D and the cache area 12C are erased.

  Hereinafter, S14 to S24 are the same as in the first embodiment. However, when the ejection operation is finally started in S22 and the magneto-optical disk B is ejected, the CPU 11 starts measuring the disk replacement time. The timer is started (S52). That is, the disk replacement time is counted as the time when the magneto-optical disk B is not inserted into the disk drive device A.

  In S51, when the disc replacement time is shorter than the reference time (S51: YES), the CPU 11 maintains the current state of all contents stored in the RAM 12 as shown in FIG. 6 (S30), and stores DMA information. The previous DMA information remaining in the area 12D can be used for address conversion (S31). That is, when the magneto-optical disk B is inserted and removed in such a short time that it cannot be replaced with another one, the operation of reading the DMA information from the magneto-optical disk B inserted for the second time is omitted, and the previous one is obtained. DMA information is again used. The cache area 12C of the RAM 12 is also in a state where the previous data is left as it is.

  Thereafter, S32 to S39 are the same as those in the first embodiment.

  Therefore, according to the second embodiment, immediately after the magneto-optical disk B is ejected, when the same magneto-optical disk B is inserted again in a short time to read / write data, the magneto-optical disk B is read for the second time. The process of reading the DMA information B2 when loading is omitted. As a result, the time required for loading is shortened compared to the first time, and even if data read / write is instructed immediately after the second magneto-optical disk B is inserted, there is no seek operation and the personal computer C is not connected. Data transfer can be started immediately, and the response time at that time can be shortened.

  Similarly, when the same magneto-optical disk B is inserted / removed within a short time, the previous data remaining in the cache area 12C can be used as it is even after the second loading, so that the second magneto-optical disk B is used. When the data is read from the personal computer C, the probability of hitting the data in the cache area 12C is increased, and the response time when the personal computer C requests to read the data can be shortened.

  In addition, this invention is not limited to said embodiment.

  For example, the recording disk is not limited to MO, but may be, for example, an MD or iD format magneto-optical disk, or a phase change type or write-once type optical disk such as a DVD or CD-ROM, or a hard disk. It can also be applied to magnetic recording magnetic disks such as disk and flexible disks.

  In the second embodiment, whether or not to keep the contents of the memory as it is based on only the disk replacement time is switched. However, even if the disk replacement time is longer than the reference time, As described above, it may be a control algorithm that determines whether or not the medium identification information matches the current time and the previous time and switches according to the determination result.

  The loading of the magneto-optical disk B has been described up to the second time, but the same applies to the third and subsequent times.

It is a block diagram for demonstrating the 1st Embodiment of this invention. 1 is a functional block diagram of a disk drive device according to a first embodiment of the present invention. It is a flowchart by a 1st embodiment. It is a flowchart following FIG. It is a functional block diagram of the disc drive apparatus by the 2nd Embodiment of this invention. It is a flowchart by a 2nd embodiment. It is a flowchart following FIG. It is a block diagram for demonstrating a prior art example. It is explanatory drawing for demonstrating the zone of a state without a defect. It is explanatory drawing for demonstrating PDL by a 1st defect. It is explanatory drawing for demonstrating SDL by a 2nd defect.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Control part 2 Optical head 3 Magnetic head 4 Motor drive circuit 11 CPU
12 RAM
12C Cache area 12D DMA information storage area 12W Work area 13 ROM
14 interface circuit 15 bus line 21, 31 medium type acquisition unit 22, 33 determination unit 23, 34 address conversion unit 24, 35 data read / write unit 25, 36 memory control unit 26, 37 memory 32 timer unit A disk drive device B magneto-optical Disc B1 Control track B2 DMA information B3 Recording area C Personal computer

Claims (4)

When the recording disk is loaded, the medium identification information inherently held by the recording disk is read, and the DMA information in which a list of defective addresses is read and stored in the memory, while address conversion is performed with reference to the DMA information. However, a disk drive device for transferring data between the recording disk and the host,
A determination unit for determining whether the medium identification information obtained by reading this time and the medium identification information obtained by reading the previous time stored in the memory at the time of loading the recording disk are different from each other;
When the determination unit obtains a determination result that the current medium identification information is different from the previous medium identification information, the DMA information is read from the recording disk and the DMA information is stored in the memory the previous time. A memory control unit that replaces the read DMA information and prohibits reading of the DMA information from the recording disk when a determination result is obtained that the current medium identification information and the previous medium identification information are the same. And a disk drive device. While reading the medium identification information inherently held by the recording disk when the recording disk is loaded, when the host is instructed to read data, the host reads the data from the recording disk and temporarily stores it in the cache memory. A disk drive device that transfers data to
A determination unit for determining whether the medium identification information obtained by reading this time and the medium identification information obtained by reading the previous time stored in the memory at the time of loading the recording disk are different from each other;
When the determination unit obtains a determination result that the current medium identification information is different from the previous medium identification information, the contents of the cache memory are erased, and the current medium identification information and the previous medium identification are determined by the determination unit. When the determination result that the information is the same is obtained, a memory control unit that holds the contents of the cache memory;
When reading data from the host is instructed, a determination unit that determines whether the data exists in the cache memory;
If it is determined that the data instructed to be read by the determination unit is present in the cache memory, the reading of the data from the recording disk is prohibited and the data is read from the cache memory and transferred to the host. A data read control unit that reads the data from the recording disk, temporarily stores the data in the cache memory, and then transfers the data to the host A disk drive device characterized by that. When the recording disk is loaded, the medium identification information inherently held by the recording disk is read, and the DMA information in which a list of defective addresses is read and stored in the memory, while address conversion is performed with reference to the DMA information. However, a recording disk loading control method for transferring data between the recording disk and the host,
A determination step for determining whether the medium identification information obtained by reading this time stored in the memory at the time of loading the recording disk is different from the medium identification information obtained by reading the previous time;
When it is determined in the determination step that the current medium identification information is different from the previous medium identification information, the DMA information is read from the recording disk, and the DMA information is stored in the memory in the previous time. When the determination result that the current medium identification information and the previous medium identification information are the same is obtained by the determination step, reading of the DMA information from the recording disk is prohibited. And a memory control step for controlling the loading of the recording disk. While reading the medium identification information inherently held by the recording disk when the recording disk is loaded, when the host is instructed to read data, the host reads the data from the recording disk and temporarily stores it in the cache memory. A recording disk loading control method for transferring data to
A determination step for determining whether the medium identification information obtained by reading this time stored in the memory at the time of loading the recording disk is different from the medium identification information obtained by reading the previous time;
If it is determined in the determination step that the current medium identification information is different from the previous medium identification information, the contents of the cache memory are erased, and the current medium identification information and the previous medium identification are determined in the determination step. When the determination result that the information is the same is obtained, a memory control step for holding the contents of the cache memory;
A determination step of determining whether or not the data exists in the cache memory when the host is instructed to read the data;
If it is determined by the determination step that the data instructed to be read exists in the cache memory, reading of the data from the recording disk is prohibited, the data is read from the cache memory, transferred to the host, And a data reading control step of reading the data from the recording disk and temporarily storing the data in the cache memory and then transferring the data to the host when it is determined that the data instructed to be read does not exist in the cache memory. A recording disk loading control method.

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