JP3601702B2 - Information processing apparatus and information processing method - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an information processing device and an information processing method, and can be applied to, for example, a removable hard disk device that records video data and audio data. According to the present invention, every time output data from the host device is recorded by a predetermined data amount, information of the data amount of the recorded data is recorded in a predetermined area, and when the management data is updated, the information of the data amount is recorded. reset However, at the time of startup, by executing a repair process based on the management data, During recording To Even if an abnormality occurs, recorded data is effectively protected so that AV data and the like can be reliably recorded.
[0002]
[Prior art]
Conventionally, in a hard disk device used as a peripheral of a personal computer, data recorded on the hard disk can be managed in units of clusters composed of a plurality of sectors by management data recorded on the hard disk. The management is performed by a personal computer as a host device.
[0003]
That is, as shown in FIG. 6, a hard disk usually divides an information recording surface into an inner peripheral area and an outer peripheral area, and the outer peripheral area is allocated to a system entry area.
[0004]
Further, in the hard disk, an information recording surface is concentrically divided into a plurality of zones, and tracks in each zone are divided into a plurality of sectors by dividing the tracks in the circumferential direction by a predetermined length. Hard disk Is Thus, the number of sectors per track is sequentially increased from the zone on the inner circumference side, and the information recording surface can be used efficiently by applying a zone bit recording technique of varying the recording frequency according to the zone. It has been done.
[0005]
The hard disk zoned and sectorized in this manner has a physical address based on the surface number of the information recording surface, the track number continuously allocated from the outer peripheral side of the information recording surface, and the sector number for specifying the sector in each track. Are set, and user data is file-managed by logical addresses sequentially set from the outer peripheral side of the information recording surface in correspondence with the physical address.
[0006]
Here, the logical address is represented by a cluster number in units of a cluster of a set of a plurality of logical sectors. That is, the logical sector is an area corresponding to a data recording unit set with the first area (in this case, the outermost circumference) on the information recording surface as 0 sector. For example, one physical sector is replaced with one logical sector. Correspondingly, the logical sector number can be represented by the relational expression of (logical sector number = number of sectors per track × (surface number + number of surfaces × track number) + sector number−1). . Here, the surface number, the track number, and the sector number are based on physical addresses.
[0007]
Here, the logical sector is configured so that 512 bytes of data can be recorded in one logical sector in terms of user data, and one cluster is constituted by a plurality of logical sectors. Note that one cluster is generally composed of power-of-two sectors, and is specified by a cluster number which is a serial number starting from 2 in a file area in a data area for recording user data.
[0008]
In the data area, a cluster number is assigned to each cluster set in this way, and the cluster can be accessed in cluster units based on the cluster number. In this description, the cluster number is shown in a 4-digit hexadecimal format.
[0009]
On the other hand, the system entry area is further divided into a boot area, a FAT (Fail Allocation Table) area, and a directory area, and data defining the structure of the disc is recorded in the boot area. On the other hand, in the FAT area and the directory area, address information and the like necessary for accessing the user data recorded in the data area are recorded. In the FAT area, the same information is redundantly recorded in the main FAT and the sub FAT, so that reliability can be ensured.
[0010]
That is, in the directory area, the file name of each file recorded in the data area, the cluster number of the first cluster which is the recording start position of each file, and the like are recorded. On the other hand, in the FAT area, a cluster number and the like of each cluster continuous with the first cluster of each file are recorded. This allows the hard disk Is After detecting the top cluster number of the desired file name from the directory area, and sequentially detecting the cluster number following this top cluster number from the FAT area, it is possible to detect the addresses of consecutive clusters constituting one file. It has been made.
[0011]
Thus, in FIG. 6, when the file 1 is recorded in the clusters having the cluster numbers 1234h to 1240h in the data area, the code indicating the cluster number 1234h of the first cluster of the file 1 is recorded in the directory area. Further, a cluster number subsequent to the cluster number 1234h is sequentially recorded in a corresponding area of the FAT area. In FIG. 6, EOF (End Of File) is identification information indicating the last cluster of one file.
[0012]
More specifically, in the directory area, file management data having the configuration shown in FIG. 7 is recorded for each file recorded in the data area. That is, in the file management data, the file name is assigned to the first 8 bytes, and the extension of each file is assigned to the next 3 bytes. Data indicating the attribute of the file is assigned to the next 1 byte, and the next 10 bytes are assigned to the data for reservation. The next 2 bytes are the recording start time data, and the next 2 bytes are the recording Of the day A cluster number, which is the first cluster number, is assigned to the data and the next two bytes are assigned. Note that data of the file length is allocated to the last four bytes.
[0013]
On the other hand, in the FAT area (FIG. 6), a cluster address is assigned corresponding to the cluster number of the data area, and the cluster number of the cluster following each cluster address is recorded. As shown in FIG. 8, among codes not assigned to these cluster numbers, predetermined codes are assigned to identification information indicating a free area, a defective cluster, and EOF, respectively.
[0014]
Thus, the hard disk detects the leading cluster number of the desired file from the directory area and sequentially traces the FAT area, thereby sequentially tracing the cluster number of the cluster in which the desired file is recorded. This This file can be accessed by the cluster number detected in this way. Similarly, the FAT area can be accessed to detect a free area in the data area. These allow the hard disk to manage the information recording surface in predetermined block units.
[0015]
On the other hand, interfaces for accessing the hard disk device include ATA (AT Attachment), SCSI (Small Computer System Interface), and the like. In a personal computer using these interfaces, for example, when the power is turned on, data recorded on the hard disk is used. Upload management data.
[0016]
That is, FIG. 9 shows a processing procedure showing the upload of the management data. In the hard disk device, for example, when the power is turned on, the process proceeds from step SP1 to step SP2, and a read command of the system entry area is issued from the host device. In the following step SP3, in response to this command, data in the system entry area is read from the hard disk and transmitted to the host device. Accordingly, in the conventional system, in the subsequent step SP4, the data of the system entry area is recorded in the memory of the host device so that the data can be used for issuing a series of write and read commands, and then the process proceeds to step SP5. This processing procedure ends.
[0017]
In the personal computer, parameters are set on the basis of the management data uploaded in this manner, and access is instructed to the hard disk device. That is, for example, when reading a desired file, a read command is issued by setting the start address of the file (FAT entry number of the directory) and the transfer length in clusters as parameters. Also at the time of writing, similarly, a write command is issued, and data to be recorded is sequentially transmitted.
[0018]
That is, FIG. 10 is a flowchart showing a write process based on management data recorded in the memory of the host device. In this case, the host device proceeds from step SP11 to step SP12, searches the management data recorded in the host memory, and detects a cluster number (free cluster address) in which a code indicating a free area is set.
[0019]
Upon detecting the free cluster address in this way, in the next step SP13, the host device sets a parameter (which is a write address based on an LBA (logical block address)) based on the free cluster address and the transfer length, and issues a write command. After the issuance, in step SP14, the data to be recorded is sent to the hard disk device for the transfer length. In the hard disk device, in the following step SP15, the data transmitted subsequently in response to the write command is recorded in the buffer memory, and in the following step SP16, the data recorded in the buffer memory is stored in the free space specified by the host device. Record sequentially in the cluster.
[0020]
When the recording of the data transmitted from the host device is completed in this way, the hard disk device interrupts the host device in step SP17. In the host apparatus, the process proceeds to step SP18 due to the interruption, and determines whether or not the transfer of all data to be recorded has been completed. If a negative result is obtained here, the process returns to step SP12. As a result, the host device repeatedly issues a write command for a file having a large data amount and sends out the data. In the hard disk device, in response to the command, the data is sequentially recorded in an empty cluster designated by the host device. I do.
[0021]
On the other hand, when the transfer of all data to be recorded is completed, a positive result is obtained in step SP18, and the host device proceeds to step SP19, in which the contents of the system entry area recorded in the host memory are recorded in this file. And instructs the hard disk device to update the system entry area so as to correspond to this update, and moves to step SP20 to end this processing procedure.
[0022]
With these processes, the conventional hard disk device executes the writing and reading processes under the management of the host device.
[0023]
[Problems to be solved by the invention]
In recent years, this type of hard disk device has been miniaturized and has a high recording density, and the recording of audio data and video data (hereinafter referred to as AV data) can be carried by using the hard disk device. Thus, it is considered that a recording device capable of recording for a long time can be created. That is, it is considered that various AV devices such as a small and portable video camera can be configured by using the hard disk device instead of the video tape recorder.
[0024]
However, in the case where various types of AV equipment are configured by applying to recording of AV data in this way, the number of abnormal terminations during recording is significantly increased as compared with the case where the device is used as a peripheral of a computer. It is thought that. That is, the operation may be stopped due to running out of the battery during recording, or the power supply may be turned off during recording due to an erroneous operation. Further, there is a case where the recording apparatus is accidentally removed, and further, an abnormality due to vibration, drop, or the like is also considered.
[0025]
In the interface of the conventional hard disk device, after the recording of data to the hard disk is completed as described above, the system entry area is updated, and the data area is reproduced according to the recording of the updated system entry area. As a result, when such an abnormality occurs, there is a problem that data recorded on the hard disk cannot be reproduced correctly up to the time of occurrence of the abnormality.
[0026]
One method of solving this problem is to update the directory area and the FAT area each time data is written during recording, so that the data recorded before the occurrence of an abnormality can be recorded by recording the directory area and the FAT area. It is thought that it can be protected.
[0027]
That is, in this type of interface, since the maximum transfer length is, for example, 256 sectors (in the case of the ATA standard), when accessing a file having a large size, the personal computer sequentially updates parameters and issues a read command. Issue repeatedly.
[0028]
In the hard disk device, the data is reproduced from the head cluster designated in response to this command by the transfer length and output to the personal computer, and when reading a large file, the read command from the personal computer is read. In response to this, a series of data is reproduced from a hard disk and output to a personal computer by repeating the same processing.
[0029]
As in the case of reading, when writing a large file, the personal computer sequentially updates the parameters and repeatedly issues a read command. In response to this, the hard disk device writes the read command from the personal computer. By repeating the same processing in response to a command, a series of data is input from a personal computer and recorded on a hard disk.
[0030]
That is, FIG. 11 is a flowchart illustrating a processing procedure when a file is registered for each command from the host device. In this case, the host device proceeds from step SP21 to step SP22, searches the management data recorded in the host memory, and detects a cluster number (free cluster address) in which a code indicating a free area is set.
[0031]
When the free cluster address is detected in this manner, the host device sets a parameter based on the free cluster address and the transfer length and issues a write command in the following step SP23, and then, in the next step SP24, issues data to be recorded. The data is transmitted to the hard disk device for the transfer length. In the hard disk device, in the following step SP25, data transmitted subsequently in response to the write command is recorded in the buffer memory, and in the following step SP26, the data recorded in the buffer memory is stored in the free space designated by the host device. Record sequentially in the cluster.
[0032]
When the recording of the data transmitted from the host device is completed in this way, the hard disk device updates the recording of the main FAT so as to correspond to the recording of the data in step SP27, and then similarly proceeds to step SP28. Update the record of the sub-FAT. In the following step SP29, the record in the directory area is updated. In recording the main FAT, sub-FAT, and directory area, the hard disk device interrupts the host device upon completion of the immediately preceding process, and executes each write process by a command issued from the host device in response to the interrupt. It has been made to be.
[0033]
When the system entry area is updated in this way, the hard disk device interrupts the host device in step SP30. In response to this interrupt, the host device proceeds to step SP31 where it determines whether or not all data transfer for recording has been completed. If a negative result is obtained here, the process returns to step SP22. If a positive result is obtained at step SP32, the process moves to step SP32 and this processing procedure ends. As a result, the host device repeatedly issues a write command for a file having a large data amount and sends out the data. In the hard disk device, in response to the command, the data is sequentially recorded in an empty cluster designated by the host device. At the same time, the management data is sequentially updated in response to this.
[0034]
However, in this method, it is necessary to execute three seeks to access the main FAT, sub FAT, and directory area. According to the seek time required for this seek and the rotation waiting time, the file registration executed for each command is performed. Takes time. Thus, in the case of this method, the time required for file registration is longer than the actual AV data write time, and there is a problem that it is difficult to record continuous AV data without interruption. Incidentally, in the hard disk device, the recording speed depends on the linear recording density, the disk rotation speed, and the disk diameter. Therefore, when the diameter of the hard disk is reduced as in recent years, such a problem is remarkable.
[0035]
The present invention has been made in view of the above points, and an information processing apparatus and information capable of effectively protecting recorded data and reliably recording AV data and the like even when an abnormality occurs during recording. It is intended to propose a processing method.
[0036]
[Means for Solving the Problems]
In order to solve this problem, the invention according to claim 1 is applied to an information processing apparatus, In response to an instruction from the host device, the management data is read from the recording medium and output to the host device. The data area is managed by the control of the host device based on the management data output to the host device. Is updated, and the host device is updated by a command from the host device. Each time the output data is recorded for a predetermined data amount, In the recording area for management data The information of the data amount of the recorded output data is recorded, and at a predetermined timing, the management data is updated so as to correspond to the recording of one file by the output data in the data area, and the information of the data amount is updated. Reset, At the time of start-up, it is determined whether or not the data amount information is reset. Based on the determination result, a head area set as a free area is detected by the management data. The data recorded up to the area specified by is set in one file, the management data is updated, and the data amount information is reset. I do.
[0037]
Claims 4 In the invention of the above, applied to the information processing method, In response to an instruction from the host device, the management data is read from the recording medium and output to the host device. The data area is managed by the control of the host device based on the management data output to the host device. To update the output data output from the host device. Every time a predetermined amount of data is recorded, In the management data recording area, The data amount information of the recorded output data is recorded, and at a predetermined timing, the management data is updated so as to correspond to the recording of one file by the output data in the data area, and the data amount information is reset. At the time of startup, it is determined whether or not the data amount information is reset. Based on the result of the determination, the head area set as a free area is detected by the management data, and the data amount is determined from this head area. The data recorded up to the area specified by the information is set in one file, the management data is updated, and the data amount information is reset. I do.
[0038]
According to the configuration of claim 1, every time the output data is recorded by a predetermined data amount, In the management data recording area, The data amount information of the recorded output data is recorded, and at a predetermined timing, the management data is updated so as to correspond to the recording of one file by the output data in the data area, and the data amount information is reset. Accordingly, even if it becomes difficult to update the management data at the predetermined timing due to various abnormalities, it is determined whether or not the recorded data exists based on whether or not the data amount information is reset. Can be. Thus, at the time of start-up, it is determined whether or not the data amount information is reset. Based on the determination result, the head area set as a free area is detected by the management data, and the data amount is determined from this head area. By setting data recorded up to the area specified by the information in one file, updating the management data, and resetting the information on the data amount, From the management data, An abnormal occurrence has occurred The recording start position of the recorded data can be detected, and the end of the recorded data can be detected from the recording start position based on the data amount information. And The file from the recording start position detected in this way to the end of the recorded data is handled as one file. Can be Even if an abnormality occurs during recording, the recorded data can be effectively protected and AV data and the like can be reliably recorded.
[0039]
This makes the claim 4 According to the configuration, even if an abnormality occurs during recording, it is possible to provide an information processing method capable of effectively protecting recorded data and recording AV data or the like without fail.
[0040]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
[0041]
(1) Configuration of the embodiment
FIG. 2 is a block diagram showing a hard disk device according to the embodiment of the present invention. The hard disk device 1 is mounted on an AV device 2 such as an imaging device and a set-top box, a personal computer (PC), and the like, and records various data output from these devices. In addition, recorded data is reproduced and output while being attached to these devices or being detached from these devices and attached to other AV devices, personal computers, or the like.
[0042]
Therefore, the hard disk device 1 is detachably held in an AV device or the like, and inputs and outputs data and text data obtained by compressing the AV data in a predetermined format to and from the AV device 2. A control command, status data, address, and the like accompanying the input / output of the data are input / output to / from these devices. Further, these data are recorded on the hard disk 3, and the data recorded on the hard disk 3 is reproduced and output.
[0043]
Here, the hard disk 3 records AV data data output from the AV device 2 in the format described above with reference to FIGS. 6 to 8, reproduces the recorded AV data data, and outputs the data to the AV device 2.
[0044]
The servo circuit 4 drives the motor (M) 6 under the control of the hard disk control circuit 5, thereby rotating the hard disk 3 at a predetermined rotation speed. Similarly, the servo circuit 4 drives the motor (M) 8 to seek the magnetic head, and further performs tracking control.
[0045]
Under the control of the hard disk control circuit 5, the read / write data channel unit 9 encodes the output data of the hard disk control circuit 5 at the time of recording by a method suitable for the characteristics of the recording / reproducing system to generate bit sequence data, The magnetic head is driven by this data. At the time of reproduction, the read / write data channel section 9 performs signal processing on a reproduction signal obtained from the magnetic head to generate reproduction data, and outputs the reproduction data to the hard disk control circuit 5.
[0046]
The hard disk control circuit 5 is a control circuit that manages data on the hard disk 3 according to an instruction from the interface control circuit 11, and controls the operation of the servo circuit 4 in accordance with AV data input via the buffer memory 10, By outputting the AV data to the read / write data channel section 9, the AV data is recorded in the cluster specified by the interface control circuit 11. At the time of reproduction, the operation of the servo circuit 4 is similarly controlled to output the output data of the read / write data channel section 9 to the buffer memory 10, thereby reproducing the cluster specified by the interface control circuit 11.
[0047]
The interface control circuit (IF control) 11 is formed of, for example, a SCSI controller, an IDE controller, an ATA controller, and the like, and constitutes an input / output circuit for transmitting and receiving data to and from the AV device 2 and control commands. That is, the interface control circuit 11 analyzes a command input from the AV device 2 and parameters set in the command, and controls operations of the hard disk control circuit 5 and the like. At the time of writing, the AV data input from the AV device 2 is output to the hard disk control circuit 5 via the buffer memory 10, and at the time of reproduction, the hard disk control circuit 5 is output via the buffer memory 10. The output AV data is output to the AV device 2.
[0048]
In response to this, in the AV device 2, various commands and the like are transmitted to the hard disk device 1 in accordance with an instruction from a higher-level controller by processing of a central processing unit (CPU) 2A having a work area secured in a memory 2B. .
[0049]
In this processing, when the power is turned on, the central processing unit 2A executes a predetermined processing procedure to store data of the boot area, FAT area, and directory area, which are management data recorded in the system entry area of the hard disk 3, in the memory 2B. And sends various commands by setting parameters based on the uploaded data.
[0050]
That is, FIG. 1 is a flowchart showing a writing process based on the management data recorded in the memory 2B. In this case, in the central processing unit 2A of the AV device 2, the process proceeds from step SP41 to step SP42, in which the management data recorded in the memory 2B is searched, and a cluster number (free cluster address) in which a code indicating a free area is set. ) Is detected.
[0051]
Upon detecting the free cluster address in this manner, the host device sets a parameter based on the free cluster address and the transfer length and issues a write command in the subsequent step SP43, and then issues data to be recorded in the subsequent step SP44. The data is transmitted to the hard disk device for the transfer length. In the hard disk device, in the following step SP45, data transmitted subsequently in response to the write command is recorded in the buffer memory 10, and in the following step SP46, the data recorded in the buffer memory 10 is designated by the AV device 2. Are sequentially recorded in the empty clusters.
[0052]
When the recording of the data transmitted from the AV device 2 is completed in this way, in step SP47, the hard disk device records the recording processing information of the recorded AV data in the predetermined area for the file to be recorded in this manner. I do. Here, in this embodiment, the recording area is a previously set area in the system entry area as shown in FIG. 3 in comparison with FIG. On the other hand, the recording processing information is assigned information on the amount of data for which recording has been completed, and this data amount (the number of clusters) is expressed in units of clusters, which are recording units of the hard disk 3. I have.
[0053]
After recording the recording processing information in this way, the hard disk device proceeds to step SP48 and interrupts the AV device 2. In the AV device 2, the process proceeds to step SP49 by this interrupt, and determines whether or not transfer of all data to be recorded has been completed. If a negative result is obtained here, the process returns to step SP42. Thus, the AV device 2 repeatedly issues a write command for a file having a large data amount and sends out data. In the hard disk device, the AV device 2 updates the recording processing information in response to the command, and Data is sequentially recorded in designated empty clusters.
[0054]
On the other hand, when the transfer of all data to be recorded is completed, a positive result is obtained in step SP49, and the AV device 2 proceeds to step SP50, and the recording in the memory 2B is performed so as to correspond to the recording of this file. And instructs the hard disk device 1 to update the system entry area. In a succeeding step SP51, a reset of the recording processing information is instructed, and in the hard disk device 1, the value of the number of clusters according to the recording processing information is updated to a value 0 according to the instruction. I do.
[0055]
With these processes, the hard disk device records recorded commands in succession by the AV device 2 in succession. Mino While recording the data amount information in the system entry area of the hard disk 3, the AV data output from the AV device 2 is recorded, and the FAT area and the like are updated according to the instruction of the AV device 2, and the recording process information is reset. Thus, even if an abnormality occurs during recording, data restoration processing can be executed as needed.
[0056]
FIG. 4 is a flowchart illustrating a processing procedure when the hard disk device 1 is started. In the process at the time of startup, the hard disk device 1 executes a restoration process as necessary based on the above-mentioned recording process information, thereby effectively protecting data recorded due to abnormal termination.
[0057]
That is, in the hard disk device, when the power is turned on, the process proceeds from step SP61 to step SP62, where a read command of the system entry area is issued from the AV device 2, and in the following step SP63, the data of the system entry area is read in response to this command. The data is read from the hard disk and transmitted to the AV device 2. Thus, in the AV device 2, in the subsequent step SP64, the data of the system entry area is recorded in the memory 2B.
[0058]
When the same processing as the conventional power-on operation is performed in this way, in the hard disk device 1, the recording processing information is read out in the following step SP65, and in the following step SP66, it is determined whether or not this recording processing information has been reset. That is, in this embodiment, it is determined whether or not the number of clusters, which is the file size, is set to the value 0.
[0059]
Here, if a positive result is obtained, in this case, the system entry area is updated to correspond to the recording of the data area without ending the operation in the middle of the recording due to any abnormality, and the operation ends. Then, the hard disk device 1 proceeds from step SP66 to step SP67 and ends this processing procedure (FIG. 5).
[0060]
On the other hand, if a negative result is obtained in step SP66, the operation ends in the middle of recording due to some abnormality, and the system entry area is not updated so as to correspond to the recording of the data area. Then, the hard disk device 1 proceeds from step SP66 to step SP68. Here, the hard disk device 1 detects the head of the free area from the data in the system entry area by the same algorithm as the algorithm for detecting the free cluster executed in the AV device 2. Similarly, free clusters are sequentially detected from the beginning of this free area by the number of clusters obtained from the recording processing information.
[0061]
When the free area corresponding to the number of clusters of the recording information processing is detected from the data in the system entry area in this manner, the hard disk drive proceeds to step SP69 to record the detected free area as one file. Then, the FAT data is updated on a predetermined memory so as to correspond to this one file. In the following step SP70 (FIG. 5), the data in the directory area is updated on the memory so as to correspond to this one file.
[0062]
In this way, the hard disk device 1 updates the data in the system entry area on the memory with the data recorded due to the abnormal termination as one file, and notifies the AV device 2 of the update.
[0063]
Thus, in the subsequent step SP71, the hard disk device 1 obtains a write command for instructing the updating of the FAT area from the AV device 2, and in the subsequent step SP72, the main FAT and the sub FAT correspond to the recording on the memory. Update the FAT record. By updating the record, the AV device 2 is interrupted in the following step SP73.
[0064]
In addition, due to this interruption, in the following step SP74, a write command instructing the update of the directory area is obtained from the AV device 2, and in the subsequent step SP75, the recording of the directory area is updated so as to correspond to the recording on the memory. I do. Further, in these steps, after the recording processing information is reset in the subsequent step SP76, the process proceeds to step SP77 to interrupt the AV device 2, and proceeds to step SP67 to end this processing procedure.
[0065]
(2) Operation of the embodiment
In the above configuration, the hard disk device 1 (FIG. 2) is mounted on an AV device 2 such as an imaging device or a set-top box, and when the power is turned on, the data recorded in the system entry area of the hard disk 3 is transferred. The data is read, transferred to the AV device 2, and recorded in the memory 2B.
[0066]
When the data recorded on the hard disk 3 is reproduced and output to the AV device 2 in a state where the management data in the data area is downloaded from the hard disk 3 in this manner, the AV device 2 performs The data in the directory area is searched to detect the start address of the desired file (FIG. 3). Further, based on the start address, the data in the FAT area are sequentially traced to detect continuous cluster addresses. Is detected by the AV device 2. In the hard disk device 1, a playback command based on the cluster address detected in this way is output from the AV device 2, the cluster specified by this address is sequentially played back to obtain playback data, and the playback data is output to the AV device 2. I do. Thus, in this system, AV data and the like recorded on the hard disk 3 can be reproduced.
[0067]
On the other hand, at the time of recording, in the AV device 2, empty areas on the hard disk 3 are sequentially detected from the data in the FAT area recorded in the memory 2B. A write command specifying the cluster of the empty area detected in this way is output from the AV device 2, and the hard disk device 1 records the AV data sequentially input to the empty cluster specified by the command, The recording processing information based on the information of the data amount for which recording has been completed is recorded. When the recording is completed, the recording of the system entry area is updated by the instruction of the AV device 2, the data of the system entry area loaded on the AV device 2 is updated, and the recording processing information is reset.
[0068]
When a file having a large data amount is recorded, the file is divided in units of a predetermined data amount, a write command is repeatedly issued from the AV device 2, and recording of the AV data of each data amount is repeated. In response to the repetition of the recording, the recording processing information is sequentially updated. When the recording of one file is completed in this way, the recording of the system entry area is updated according to an instruction from the AV device 2, and the data of the system entry area loaded on the AV device 2 is updated. Information is reset.
[0069]
When recording a file having a large amount of data by a repetitive write command as described above, if recording becomes difficult due to an abnormality such as dropping or running out of battery, data in the system entry area is not updated on the hard disk 3. As a result, depending on the recording in the system entry area, it becomes difficult to reproduce the recorded data recorded up to this abnormal time.
[0070]
However, in this embodiment, when the AV data is recorded on the hard disk 3 by a predetermined data amount, the recording processing information is updated, the management data is updated when the recording of one file is completed, and the recording processing information is reset. This makes it possible to detect the presence or absence of recorded data that has been terminated without updating the management data due to such an abnormality, based on whether or not the recording processing information has been reset. Further, the recording start position of such recorded data can be detected by the management data, and the end of the recorded data is confirmed by sequentially tracing the management data by the data amount according to the recording processing information. Can be. Thus, the data from the recording start position detected in this way to the end area of the recorded data is processed as one file, and the recorded processing information is used to recover the recorded data recorded up to the time of occurrence of the abnormality. Therefore, it is possible to effectively protect the recorded data.
[0071]
Further, in this embodiment, the recording of such a file is sequentially performed in the free space, so that the amount of data recorded is represented by the number of clusters, which is a recording unit on the hard disk 3, so that the number of clusters is calculated. Is set in the recording processing information to indicate the end of the recorded area, whereby it is possible to easily and reliably detect in which area this type of recorded data is recorded. Thus, in this embodiment, the processing at the time of recording is simplified, and the overall configuration can be simplified accordingly. By judging whether or not the number of clusters allocated to this recording processing information is a value 0, it is determined whether or not the operation has been completed without correctly updating the system entry area, that is, whether or not recorded data due to an abnormality exists. Can be easily determined.
[0072]
That is, in the hard disk device 1, when the power is turned on, the data in the system entry area is transferred to the AV device 2, and then it is determined whether or not the number of clusters set in the recording processing information is 0, thereby ending the operation due to an abnormality. Then, it is determined whether or not the recorded data is recorded on the hard disk 3. Further, when such recorded data remains on the hard disk 3, the head empty cluster is detected from the recording of the system entry area, and the number of the head empty clusters is further increased by the number of clusters recorded in the recording processing information. Empty clusters are sequentially detected from the clusters, the record of the cluster thus detected is set in one file, and the record in the system entry area is updated to correspond to this setting. As a result, in the hard disk device, even if an abnormality occurs during recording, the recorded data can be effectively protected and AV data can be reliably recorded.
[0073]
In this embodiment, the processing is performed merely to update the recording processing information by accessing the system entry area, so that each time a write command is issued, the main FAT, Such as the case of accessing and updating the sub-FAT and directory area (Fig. 1 1 ), It is possible to record continuous AV data without requiring much time for seeking.
[0074]
(3) Effects of the embodiment
According to the above configuration, every time output data from the host device is recorded by a predetermined data amount, information on the data amount of the recorded data is recorded in a predetermined area, and when the management data is updated, the data amount is updated. By resetting this information, even if an abnormality occurs during recording, the recorded data can be effectively protected and AV data and the like can be reliably recorded.
[0075]
Also, at this time, by indicating such a data amount in units of a cluster which is a recording unit of the hard disk, it is possible to identify the end of the recorded data in association with the file management by the management data. Accordingly, the entire processing can be simplified.
[0076]
In addition, the management data is updated by a command from the host device, and the information of the data amount is reset, so that a file having a large data amount is managed by the host device. The hard disk drive can be connected to another host device so that compatibility with a conventional file management system can be achieved.
[0077]
Further, at the time of activation, by judging the presence or absence of reset of the information of the data amount and restoring the recorded data, the recorded data can be restored as necessary, and wasteful processing can be effectively avoided.
[0078]
In this restoration process, the head area of the free area is detected based on the management data, and one file is set from the head area to update the management data, thereby enabling the algorithm of this type of file management system to be effective. To perform a repair process.
[0079]
(4) Other embodiments
In the above-described embodiment, the case of recording the data amount by the number of clusters has been described. However, the present invention is not limited to this. The present invention can be widely applied to a case where the data amount is recorded in units and a case where the data amount is recorded by various expression methods.
[0080]
Further, in the above-described embodiment, the case where the data amount information is simply assigned to the recording processing information has been described. However, the present invention is not limited to this, and the FAT entry number, the directory position (the directory of the file is written, etc.) May be written together. If the FAT entry number is recorded in this way, it is possible to omit the process of detecting the leading empty area in the restoration process.
[0081]
Further, in the above-described embodiment, the case where one file is recorded by the management of the host device to reset the recording processing information and update the management data has been described. However, the present invention is not limited to this. These processes may be executed when the hard disk is removed, when the power is turned off, or the like.
[0082]
In the above-described embodiment, the case where the recording processing information is simply recorded has been described. However, the present invention is not limited to this, and the recording processing information is written twice or three times. May be recorded to improve reliability.
[0083]
Further, in the above-described embodiment, the case where the present invention is applied to a hard disk device has been described. However, the present invention is not limited to this, and information for recording data on various disk-shaped recording media such as an optical disk and a magneto-optical disk. It can be widely applied to processing equipment.
[0084]
【The invention's effect】
As described above, according to the present invention, every time output data from the host device is recorded by a predetermined data amount, information on the data amount of the recorded data is recorded in a predetermined area, and when the management data is updated, By resetting the data amount information, even if an abnormality occurs during recording, the recorded data can be effectively protected and AV data or the like can be reliably recorded.
[Brief description of the drawings]
FIG. 1 is a flowchart showing a writing procedure in a hard disk device according to an embodiment of the present invention.
FIG. 2 is a block diagram showing a hard disk drive according to the embodiment of the present invention.
FIG. 3 is a chart showing a format of a hard disk in the hard disk device of FIG. 2;
FIG. 4 is a flowchart showing a processing procedure at the time of startup in the hard disk device of FIG. 2;
FIG. 5 is a flowchart showing a processing procedure following FIG. 4;
FIG. 6 is a table showing a recording format in a conventional hard disk.
FIG. 7 is a table showing data recorded in a directory area of FIG. 6;
FIG. 8 is a table showing codes recorded in a FAT area of FIG. 6;
FIG. 9 is a flowchart showing a processing procedure at the time of startup in a conventional system.
FIG. 10 is a flowchart showing a processing procedure at the time of writing in a conventional system.
FIG. 11 is a flowchart illustrating a process of updating a system entry area by a repeated command.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Hard disk device, 2 ... AV equipment, 2A ... Central processing unit, 2B, 3 ... Hard disk, 10 ... Buffer memory

Claims (4)

An information processing apparatus for accessing a disk-shaped recording medium according to control of a host device,
The disk-shaped recording medium,
An information recording surface is divided concentrically, and a data area for recording output data of the host device and a recording area for management data for recording management data for managing data recorded in the data area are set. And
The information processing device,
According to an instruction from the host device, the management data is read from the recording medium and output to the host device, and the data area is controlled by the host device based on the management data output to the host device. Managing and updating the management data,
Each time the output data of the host device is recorded by a predetermined data amount by a command from the host device , information of the data amount of the output data recorded is recorded in the recording area of the management data ,
At a predetermined timing, the management data is updated and the data amount information is reset so as to correspond to recording of one file in the data area by the output data ,
At the time of activation, it is determined whether or not the information of the data amount is reset,
Based on the determination result, the management data detects a head area set as a free area, and records data recorded from the head area to an area specified by the data amount information, An information processing apparatus , wherein the information for setting is set in one file, the management data is updated, and the information on the data amount is reset . The disk-shaped recording medium,
The information recording surface is separated by a predetermined recording unit,
The information on the data amount is:
2. The information processing apparatus according to claim 1, wherein the data amount is a data amount represented by the recording unit. 2. The information processing apparatus according to claim 1, wherein the predetermined timing is a timing at which an update of the management data is instructed from the host device upon completion of writing of one file by the output data. . An information processing method for accessing a disk-shaped recording medium according to control of a host device,
The disk-shaped recording medium,
An information recording surface is divided concentrically, and a data area for recording output data of the host device and a recording area for management data for recording management data for managing data recorded in the data area are set. And
The information processing method includes:
According to an instruction from the host device, the management data is read from the recording medium and output to the host device, and the data area is controlled by the host device based on the management data output to the host device. Managing and updating the management data,
Every time the output data output from the host device is recorded by a predetermined data amount, in the recording area of the management data, information on the data amount of the output data recorded is recorded,
At a predetermined timing, the management data is updated so as to correspond to recording of one file in the data area by the output data, and information of the data amount is reset,
At the time of activation, it is determined whether or not the information of the data amount is reset,
Based on the determination result, the management data detects a head area set as a free area, and records data recorded from the head area to an area specified by the data amount information, An information processing method , wherein the management data is updated in one file, and the data amount information is reset .

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