JP2006178778A - Data recorder and data recording system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To record data so that address control at the time of data reproduction can be executed in a variety of systems. <P>SOLUTION: The data recorder is provided with: a recording medium having a first system area which comprises a first table for registering a start cluster address and a second table for registering the start cluster address and an object number by associating them with each other, a second system area which comprises a management table for registering link information on data, and a user area for storing the data; a mode selection part for selecting between a first mode for referring to the second table and a second mode for referring to the management table; a first registration part for registering the start cluster address to be a recording start position in the first table when the first mode is selected; and a second registration part for generating the object number and registering it to the second table by associating the generated object number with the start cluster address. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a data recording apparatus and a data recording system that perform recording in a unique format independent of a host device when recording data supplied from a single host device connected on a network.

  In recent years, digital home appliances such as DVD recorders, digital cameras, and camcorders are rapidly spreading in general households, and the need to store and manage a large amount of digital data such as moving images, still images, and audio is increasing. Some of these data are not changed and are required to be retained for a long period of time. In some cases, since the request exceeds generations, the life of the recording medium may be exhausted first, or the file system for accessing data may be lost.

Therefore, eternal storage has been proposed in recent years to deal with these problems at the system level. The following three technologies can play important roles.
(1) Virtualization of recording media (2) Distributed processing on network (distributed management)
(3) Metadata that describes what the content of the recorded file is “Virtualization of recording medium (1)” is a technology that enables different recording media to be accessed in the same way in the future. It is. Therefore, it is necessary to prevent the access method from being affected even if the file system is changed.

  In addition, “distributed processing on the network (2)” is performed on the network in preparation for a case where, for example, some recording devices fail and access to the data cannot be performed or data is abnormal. Is moved (copied) to a safe place, or the data in which an abnormality has occurred is restored using redundancy.

  In addition, “metadata (3) describing what the content of the recorded file is” makes the future management more efficient and easy by describing the recorded content in an easy-to-understand format. Technology.

  In addition, as a means for realizing “virtualization of recording medium (1)”, access objectization is currently being studied. In this method, data is not accessed using parameters such as a logical block address (LBA) related to the physical specifications of the recording medium, but an object corresponding to the concept of a file is specified for accessing the recording medium. Is.

  For example, when reading data, the host transmits only the attributes such as the file name and size of the necessary data to the recording medium, and thereafter the recording medium finds the necessary physical address and transfers the data to the host. Therefore, the host can access the recording medium without depending on the physical specifications of the recording medium.

  As a technology for realizing such object-based access, OSD (Object based Storage) is currently attracting attention, and standardization is being promoted by the IEEE Technical Committee T10. In OSD, a 64-bit object ID is assigned to all files by a server located in the center. The server also has functions such as data access management and encryption.

JP 2001-51903 A

  By the way, the OSD has a huge system configuration, and it is difficult to say that the OSD is suitable for operation on a small network installed in a home or the like. Furthermore, every time the OSD accesses a file, the OSD must receive an access permission from the server or a decryption key, and this processing becomes a burden.

  Therefore, the present invention has been proposed in view of such circumstances, and can introduce data that can respond to access from a host device at a high speed and a stable transfer rate while introducing an OSD concept. A recording apparatus and a data recording system are provided.

  In order to solve the above-described problem, a data recording apparatus according to the present invention is a data recording apparatus that records data supplied from a single host device connected to a network, and at a data recording start position. A first system area in which a first table in which a certain start cluster address is registered, and a second table in which a start cluster address and an object number defined on the network are associated and registered; A recording medium having a second system area in which a management table in which data connection information is registered is stored, and a user area in which data is stored, and is recorded in the user area in response to a request from the host device. Refer to the second table stored in the first system area for the address information necessary to access the data When the first mode is selected by the mode selection means for selecting the first mode, the second mode referring to the management table stored in the second system area, and the mode selection means, When data is supplied from the host device, the first registration means for registering the start cluster address, which is the recording start position of the supplied data, in the first table in the user area, and the first registration means When a starting cluster address is registered in the table, an object number is generated, and a second registering unit that registers the generated object number in the second table in association with the starting cluster address is provided.

  The second registering means also registers the attribute information of the data recorded in the user area corresponding to the start cluster address when registering the object number in the second table in association with the start cluster address.

  In order to solve the above-described problem, the data recording system according to the present invention is a data recording system for recording data supplied from one host device connected on a network in a data recording device. The data recording apparatus includes a first table in which a start cluster address that is a data recording start position is registered, and a second table in which the start cluster address and an object number defined on the network are associated and registered. A recording medium having a first system area stored, a second system area storing a management table in which data connection information is registered, a user area storing data, and a host device In response to the request, the address information necessary for accessing the data recorded in the user area is Mode selection means for selecting a first mode for referring to a second table stored in the system area, a second mode for referring to a management table stored in the second system area, and mode selection When the first mode is selected by the means, when data is supplied from the host device, a first cluster address that is a recording start position of the supplied data is registered in the first table of the user area. And a second registration unit for registering the start cluster address in the second table in association with the start cluster address when the start cluster address is registered in the first table by the first registration unit.

  The second registering means also registers the attribute information of the data recorded in the user area corresponding to the start cluster address when registering the object number in the second table in association with the start cluster address.

  Furthermore, when a plurality of data recording devices are connected on the network, the one host device connected on the network is provided in the first system area of the recording medium provided in each data recording device. Reading means for reading out the stored second table, searching means for searching for duplicate object numbers from the plurality of second tables read out by the reading means, and the object number by the searching means If it is found that there is an overlap, the object number is changed by the object number changing means for changing the object number registered in the second table so that the object numbers are different, and the object number is changed by the object number changing means. Attribute to change the attribute information registered in relation to the object number. The second table whose contents are changed by the information changing means, the object number changing means and the attribute information changing means is overwritten on the first system area of the recording medium provided in the original data recording apparatus read by the reading means. Overwriting means is provided.

  In the present invention, when writing (recording) a file on a recording medium, the start cluster number of the file is registered in the first table, and the object ID is registered in the OIT in association with the start cluster number.

  Therefore, in the present invention, for a file recorded in the data recording device, a method for designating a normal LBA from a device connected on the network, a method for designating a file by a start cluster number, and a file with an object ID It is possible to access by the method specified by. Therefore, even when a device that does not support the present invention accesses a file, a high and stable transfer rate can be realized.

  At the same time, since the same object ID is assigned to copy files made to other recording devices on the network, the storage device itself can determine the identity, and the data can be stored in the network. It becomes easy to manage permanently.

  Further, in a configuration in which a new object ID is designated from a server in an external network, the host device makes a request for acquiring the object ID to the server (transmits a predetermined command), and the object Since the ID is received and registered in the OIT, when copying a file to an external recording device for the purpose of backup, the associated object ID is common between the home network and the external network, so data can be easily Can be managed.

  That is, if a copy (backup) of the original file is made to the home network and the external network, even if the original file is broken or lost, the desired data can be easily used by using the object ID. Can be found on the network.

  Further, even if a large system such as OSD is not operating, the object of access can be realized and the system can realize its usefulness, and the present invention is supported by a device that does not support the present invention. It can be connected to the same network as the device.

  Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings. In the present embodiment, the present invention comprises a host device and a data recording device having at least a rotating recording medium such as a hard disk or a rewritable optical disc, and seeks when accessing data recorded on the rotating recording medium. The present invention is applied to a recording / reproducing system capable of guaranteeing a data transfer speed even when there is a delay due to operation or rotation waiting time. Further, the recording / reproducing system in the present embodiment employs a file system that manages all data including AV data as files. Here, the data transfer time in the present embodiment includes a movement time composed of a seek operation of the head and a disk rotation waiting time, and a data write time for actually writing data, and the data transfer speed is the transfer data. Is divided by this data transfer time.

  In this embodiment, the data recording apparatus is described as having a magnetic recording medium such as a hard disk. However, the same processing can be performed on other recording media such as an optical disk such as a CD and a DVD. is there. In this embodiment, a case where a hard disk device (HDD) is applied as a recording medium and an MS-DOS compatible FAT file system is applied as a file system will be described. Any system can be applied without being limited to the MS-DOS compatible FAT file system. For example, it can also be used for a method having arrangement information (concatenation information) only for existing files such as an ext file system often used in UNIX (registered trademark).

  Here, the FAT file system is, for example, a hard disk drive (HDD) in a host device such as a PC (Personal Computer) or a medium using a nonvolatile solid-state memory as a recording medium (manufactured by Sony: Memory Stick (registered trademark), Toshiba). (Manufactured by SmartMedia (registered trademark), SanDisk: compact flash (registered trademark), multimedia card, etc.)).

  FIG. 1 is a block diagram showing a part of the data recording system in the present embodiment. As shown in FIG. 1, a data recording system 1 includes, for example, a host device 2 such as a PC or an AV device, an IDE (Integrated Drive Electronics), a SCSI (Small Computer System Interface), an FC (Fibre Channel), a USB. And a data recording device 4 connected via an interface 3 such as (Universal Serial Bus). In the following, it is assumed that the host device 2 and the data recording device 4 adopt ATA (AT Attachment) as the interface 3. Further, as shown in FIG. 2, the data recording device 4 is connected to an external network via a host device 2 such as a PC. FIG. 2 shows the entire configuration of the data recording system 1 including a home network 5 (small network) and an external network 6 (large network). The home network 5 includes a television display device. 7 and a host device 2 (PC) having two data recording devices 4 (HDDs) are connected, and a server 8 and a storage system 9 are connected to the external network 6 to transmit / receive data to / from each other. It is a system that can do.

  The data recording device 4 records various data output from the host device 2 on a disk 11 as a magnetic recording medium such as a hard disk. A voice coil motor 13 that feeds a magnetic head that reads and writes signals in the radial direction of the disk 11, a servo control unit 14 that controls the drive of the spindle motor 12 and the voice coil motor 13, and data to be written to the disk 11 And a read / write channel unit 15 that performs encoding and decoding of data read from the disk 11.

  Further, the data recording device 4 includes a disk control unit 16 that manages data on the disk 11, a buffer memory 17 that buffers data read from the disk 11 and data to be written to the disk 11, and the host device 2. It has an interface control unit 18 that constitutes an input / output circuit for data to be transmitted and received, a control command, etc., a memory 19 for storing the contents in the FAT area on the disk 11, and a CPU (Central Processing Unit) 20 for controlling these. These are connected via the bus 21.

  Further, a nonvolatile solid-state memory 22 may be further provided, and the recording area in the data recording device 4 may be a recording area composed of the disk 11 and the nonvolatile solid-state memory 22 to constitute a hybrid storage device. The non-volatile solid-state memory 22 is used as a cache for temporarily storing data from the host device 2, stores programs used at startup, and a part of a user area for storing user data. Or can be used as Since the nonvolatile solid-state memory 22 has fast access to data, for example, if data is written to or read from the nonvolatile solid-state memory 22 during a seek operation when data is written to or read from the disk 11, for example. The data transfer rate can be further improved.

  Further, the data recording device 4 receives a command issued from the host device 3 via the interface 3 by the interface control unit 18, and the interface control unit 18 understands the content and notifies the CPU 20 in the data recording device 4. To do. The CPU 20 sets necessary commands and parameters for the disk control unit 16, the read / write channel unit 15, and the servo control unit 14 based on the notification contents, and executes those operations. Also, a replacement process for defective sectors in the disk cache area is performed.

  The servo control unit 14 performs drive control of the spindle motor 9 and the voice coil motor 11 to move the head with respect to predetermined tracks and sectors of the disk 11. The read / write channel section 15 encodes (modulates) the transmitted user data into a digital bit sequence suitable for the characteristics of the recording / reproducing system when writing to the disk 11. Also, at the time of reading, high frequency noise is removed from the reproduction signal read from the head, conversion from analog signal to digital signal is performed, data is estimated using maximum likelihood decoding, and then demodulation is performed. Play user data.

  The disk control unit 16 manages data exchange among the buffer memory 17, the read / write channel unit 15, and the interface control unit 18, and performs processing related to the data format. At that time, encoding, error detection, and error correction processing are also performed.

  In response to this, the host device 2 sends various commands to the data recording device 4 in accordance with instructions from the host controller by processing of a central processing unit (CPU) 32 that secures a work area in the memory 31. To do.

  In this process, the CPU 32 uploads the data of the boot area, FAT area, and directory area, which are management data recorded in the system area of the disk 11, to the memory 31 by executing a predetermined processing procedure when the power is turned on. Various commands are sent out by setting parameters based on the uploaded data.

  Next, a data management method in this embodiment will be described. Data recorded on the disk 11 is managed in different address spaces in the host device 2 and the data recording device 4. 3A is a diagram showing an LBA space P indicating an address space viewed from the host device 2, and a right diagram of FIG. 3A is a logical sector space Q indicating an address space viewed from the data recording device 4. FIG.

  The minimum unit for recording data in the data recording device 4 is called a sector, and its size is usually 512 bytes. In the data recording device 4, the recording area of the disk 11 is managed in units of sectors, which are a physical address, a physical sector number, and a logical sector number. The physical address is composed of a surface number, a track number, and a sector number. Here, the physical sector number is a number in which all sectors are numbered in order from the outside to the inside of the disk 11. The logical sector number is an address assigned by substitution processing to a defective sector that cannot be read or written.

  On the other hand, the host device 2 accesses the disk 11 using a logical block address (Logical Block Address: LBA) instead of a logical sector number. The file system for managing files uses a plurality of sectors (N) as one cluster as a minimum unit for reading and writing. In the following description, N = 16 and one cluster is 8 Kbytes. Therefore, the cluster number is simply the LBA divided by N.

  In the present embodiment, a special access size is set particularly for AV data. Hereinafter, this is referred to as a super cluster. One super cluster is composed of a plurality of clusters (integer multiples of clusters). In the present invention, 16 clusters (128 KBytes) are set as one super cluster. The super cluster address is 1/16 of the cluster number, that is, the last one digit is deleted in hexadecimal notation.

  Here, the recording area of the disk 11 is divided into three areas: a system area SA_h for the data recording apparatus 4, a system area SA, and a user area UA. Only the system area SA and the user area UA are viewed from the host device 2. The LBA space P is allocated as shown in the left diagram of FIG. 3A.

  The system area SA_h for the data recording apparatus 4 is inaccessible from the host apparatus 2, and the details are SCT (Starting Cluster) generated (registered) according to data recorded in the user area UA in the AV mode to be described later. Address) and OIT (Object ID Table) are recorded.

  The system area SA includes an area MBR in which a master boot record is recorded, an area in which an IPL (Initial Program Loader) that is a program necessary for system boot (startup) is recorded, and a FAT area in which FAT is recorded. And have. The master boot record MBR is a sector with an LBA of 0 when viewed from the host device 2, and a bootstrap code and a partition table are recorded here.

  Here, FAT will be described. The FAT (File Allocation Table) is a table in which concatenation information indicating how files are stored in a cluster is recorded. A file system managed using the FAT is called a FAT file system. . This FAT file system uses two types of data: a FAT used to indicate where individual files are arranged on a recording medium, and directory items having information on directories and information on files.

  Normally, as shown in FIG. 3A, a FAT and a root directory area A are provided on the disk 11, and the host device 2 sends the information necessary for file access from the data recording device 4 via the PC interface. (Small Computer System Interface), IDE (Integrated Drive Electronics), IEEE 1394, USB (Universal Serial Bus), etc.) and recording / reproduction control based on them.

  For example, when writing a file to the data recording device 4, the data is written into an empty cluster, and when the writing is completed, information indicating which cluster is to be used next is written into the FAT item. When erasing a file, the written data is left as it is, and the FAT item corresponding to the used cluster is set as an empty cluster.

  Further, at the time of reading, the starting cluster number of the file is searched from the directory item, the FAT item corresponding to the file is read, the cluster to which the file data is read is known, and the data is recorded from the disk 11 to the user area UA based on this information. The data that is being read is read out. FIG. 3B shows an example of FAT. For example, even if the first super cluster from the first super cluster to the second super cluster shown in FIG. 3A does not have continuous LBAs and jumps from 1234Fh to 32350h, the data recording device 4 determines the file 1 from the directory information. By acquiring the start cluster number (12340h) and referring to the FAT, the cluster address (up to EOF) at which the file ends is acquired from the start cluster number, and the file 1 consisting of the fifth super cluster is read from the first super cluster. Can do.

  The user area UA contains directory area items for managing file information and actual data. In the FAT file system before FAT32, the root directory belongs to the system area SA. The directory item stores the file name, extension, attribute, latest update time, start cluster number, file size, and the like for each directory (each file).

  The system area SA_h is an area used by the CPU 20 to store boot codes and various tables or as an area for secondary defect replacement processing. In the logical sector space P shown in FIG. The area from 000000h to 07FFFFh (256 MByte) corresponds to that number. Therefore, unlike the LBA space viewed from the host device 2, in the logical sector space, the logical sector number of the master boot record MBR is 080000h. The host device 2 cannot directly access this area. SCT and OIT generated when data is recorded in the user area UA in the AV mode to be described later are arranged in this area. Note that SCT and OIT can be read by appropriately defined commands supplied from the host device 2.

  Next, a data writing (recording) method in the present embodiment will be described. First, the recording area of the disk 11 will be described. Super clusters for writing data are arranged in order from the top of the user area UA without a gap except for the root directory area and the like. As a result, the heads of the individual superclusters are arranged substantially evenly when viewed in the circumferential direction. This is because, in recent data recording apparatuses, the built-in disk is divided into, for example, a plurality of (10 to 20) zones, and the same write frequency and recording / reproducing parameters (coefficients of waveform equivalent filters, etc.) in each zone. This is because the zone bit recording using is adopted.

  Next, the data writing (recording) operation to the recording area described above will be described with reference to the flowchart shown in FIG. A mode in which the host device 2 manages address information necessary for accessing data recorded in the user area UA of the disk 11 is called a PC mode, and a mode managed by the data recording device 4 is called an AV mode. .

  The data recording device 4 shifts to the AV mode according to the request of the host device 2 (step ST1). The host device 2 updates the FAT stored in the system area SA of the disk 11 of the data recording device 4 to the latest one before shifting to the AV mode, and sets the command for shifting from the PC mode to the AV mode. Issued to the recording device 4.

  The control unit 16 of the data recording device 4 receives a command supplied from the host device 2 via the interface control unit 18, reads out the FAT stored in the system area SA of the disk 11 according to the received command, The read FAT is developed on the buffer memory 17 (step ST2), and a flag indicating the AV mode is set. The control unit 16 generates a command indicating the transition to the AV mode and notifies the generated command to the host device 2 (step ST3).

  The host device 2 determines the file name of the content data to be recorded in the data recording device 4, creates a new directory item, and supplies it to the data recording device 4. Here, the file name is “File1”.

  The data recording device 4 writes the directory item supplied from the host device 2 to the disk 11 (step ST4). Since the host device 2 is currently in the AV mode, the start cluster number and the latest update time are unknown, so the directory item is incomplete.

  Next, the host device 2 sets parameters necessary for writing “File1”. Specifically, the start cluster number, status flag, etc. for “File 1” are determined (step ST5). The host device 2 generates a command asking for the start cluster number for starting the recording of “File 1”, and supplies the generated command to the data recording device 4. Here, FIG. 5A shows an example of a command (Set Write File Parameter) supplied to the data recording device 4. The command is defined as an AT vendor unique command, and is executed only once before writing “File1”.

  The data recording device 4 searches for a free cluster from the user area UA based on the FAT developed in the buffer memory 17 in accordance with the supplied command, and sets the number assigned to the free cluster found by the search. Determine the recording start cluster number.

  The data recording device 4 randomly generates an object ID (number) corresponding to the determined start cluster number (step ST6), and stores the generated object ID in the system area SA_h of the disk 11 in association with the start cluster number. And register the determined start cluster number in the SCT (steps ST7 to ST8).

  Further, the data recording device 4 generates a command for notifying the host device 2 of the start cluster number determined in the process of step ST5, and supplies the generated command to the host device 2 (step ST9). Here, FIG. 5B shows an example of a command (Set Write File Parameter) supplied to the host device 2. In the command shown in FIG. 5, the parameter “1” is used to notify whether the file to be recorded is newly generated this time or whether the file existing in another data recording device connected on the network is copied. NC ”and the data recording apparatus 4 sets the OIT status flag to O (Original) or C (Copy) accordingly.

  Here, a configuration example of the SCT is shown in FIG. FIG. 6A shows that the recording start cluster number determined in step ST5 is “12340h”.

  Next, FIG. 6B shows a configuration example of the OIT. FIG. 6B shows that the recording start cluster number determined in the process of step ST5 is “12340h”, and the object ID generated in the process of step ST6 is “1AA1h”. . In addition, the status flag is set to “O” on the assumption that the file has been created for the first time. The status flag indicates the attribute of the file, “O” is “Original”, indicating that the file was created for the first time, “C” is “Copy”, and connected to the network. "D" is "Done", indicating that the status flag has been changed, and "N" is "Network". The above shows that the object ID has been adjusted.

  Further, the host device 2 that has received the recording start cluster number writes the first super cluster SC1 of “File1”. Thereafter, the host device 2 sends data to the data recording device 4 in units of super clusters. Further, the data recording device 4 writes the first start super cluster SC1 in the recording start cluster number determined in the process of step ST5. Perform a write operation. In the search for an empty cluster, the data storage device 4 searches for an empty cluster so that the writing time can be minimized or a real-time property can be emphasized so that a stable transfer rate can be obtained. In FIG. 3A, the remaining second super cluster SC2 to fourth super cluster SC4 of “File 1” are written in super cluster numbers 3235h, 5236h, and 7237h, respectively, based on the policy described above.

  The data recording device 4 determines whether or not the data transfer from the host device 2 has been completed, that is, whether the writing of data corresponding to the file 1 has been completed (end of file: EOF) (step S10). If it is not EOF, the data transferred from the host device 2 is recorded in units of super clusters, and the FAT on the memory 19 is updated at each end (step S11).

  If it is EOF, the host device 2 performs a process of writing the FAT on the memory 19 onto the disk 11 (step S12). Then, the directory item of the file 1 on the disk 11 is updated with the latest update time and the starting cluster number (step S13).

  The host device 2 changes the object ID as necessary. The object ID changing procedure will be described below with reference to the flowchart shown in FIG.

  When the host device 2 finishes writing the file to the data recording device 4 (step ST20), the host device 2 reads the status flag corresponding to the written file from the OIT of the disk 11 of the data recording device 4 (step ST21).

  It is determined whether or not the read status flag is “C” (step ST22). If the status flag is “C”, the object ID is determined from the OIT of the disk of the data recording apparatus that is the file copy source. Read (step ST23). When reading the object ID from the disk OIT of the data recording device that is the file copy source, the host device 2 generates the command (Read Attribute) shown in FIG. 8A and connects the generated command to the network. Is supplied to the copy source data recording apparatus. In response to the supplied command, the data recording device reads out an object ID (hereinafter referred to as the original object ID) corresponding to the file copied to the data recording device 4 from the OIT of the disk of the data recording device. The command shown in (b) is generated, and the generated command is supplied to the host device 2.

  The host device 2 reads the original object ID based on the supplied command, changes the object ID corresponding to the target file to the original object ID (step ST24), and changes the status flag from “C”. Change to “D” (step ST25).

  Further, when the copy source data recording apparatus is an apparatus that does not support the present invention, the object ID generated when the file is written on the disk 11 is not changed. Therefore, even when the same file is copied multiple times from a device that does not support the present invention, different object IDs are generated and regarded as different files.

  If the same object ID is accidentally assigned to different files, the difference between the files is confirmed and the object ID is changed. Hereinafter, a procedure for changing the overlapping object ID will be described with reference to the flowchart shown in FIG. In the following description, reference is made to FIG.

  The host device (PC) reads the OIT from the disks of all data storage devices (HDD1, HDD2, and storage system 9) connected on the network (step ST30), and duplicate objects from the read OIT The ID is listed (step ST31 to step ST32). The host device 2 refers to the status flag of each listed object ID, determines whether there are two or more “O” (Original) (step ST33), and when there are two or more “O”. Reads the directory item of the file corresponding to the object ID (step ST34), determines whether or not the attributes of the file match (step ST35), and proceeds to the process of step ST38 if they match, and if they do not match Then, the process proceeds to step ST36.

  If the file attributes do not match, the host device 2 generates a new object ID (step ST36). The host device 2 generates a predetermined command (Set Attribute) as shown in FIG. 10A based on the generated object ID, supplies the generated command to the data recording device, and changes the object ID (step). ST37).

  The data recording device 4 changes the object ID registered in the OIT of the target file in accordance with the command supplied from the host device 2. Then, the data recording device 4 changes the status flag of the changed object ID to “D” (step ST38).

  The host device 2 deletes the object ID for which the change process has been completed from the list of object IDs created in the process of step ST32 (step ST39), and returns to the process of step ST33.

  Further, in the case where the created file is important and it is necessary to assign a more universal object ID from the server 8 connected to the external network, the host apparatus 2 reads the OIT read in the process of step ST30. Referring to the above, the original file is searched from among the files having the duplicate object ID, and is changed to the object ID requested from the server 8 by a predetermined command (Set Attribute). Similarly, the object IDs of the other files are changed, and the status flag is set to “N” (Network).

  When reading a file, the file is designated and read using a command (Set Read File Parameter) shown in FIG. In addition, a flag OID is set in the command so that it can be read by the start cluster number or the object ID. When the flag OID is set to 1, the value specified in “Sector Count Register” or the like is used as the object ID, and when it is set to “0”, it is used as the start cluster number of the file.

  Here, how the file is created and how it is read from the network will be described with reference to FIG. 2 and its effect will be shown.

  The host device 2 (PC) writes the content reproduced on the television display device 7 as a file in the data recording device (HDD 1 or HDD 2) in the AV mode according to the procedure described above with reference to the flowchart of FIG. Do.

  The HDD 1 and HDD 2 are recognized by the host device 2 as separate partitions. The television display device 7 is similarly recognized and selectively accessed via the network.

  Further, when writing (recording) a file on the disk 11, the data recording apparatus 4 according to the present invention registers the start cluster number of the file in the SCT, generates an object ID, and uses the generated object ID as the start cluster number. Register with OIT in association with.

  Accordingly, in the present invention, the file created in the data recording device 4 (HDD 1) is stored in the home L2 designation method or file from the host device 2 or the television display device 7 on the home network. The file can be accessed using any of the method of designating and the method of designating the file by object ID. Therefore, even when a device that does not support the present invention accesses a file, a high and stable transfer rate can be realized.

  At the same time, since the same object ID is assigned to the copy file made to another recording device (HDD 2) on the network as described above, the storage device itself can determine the identity. Therefore, it becomes easy to manage data permanently in the network.

  In the configuration in which a new object ID is specified from the server 8 in the external network 6, the host device 2 (PC) makes a request to the server 8 to acquire the object ID (a predetermined command The object ID is received. Therefore, when copying a file to an external recording device (storage system 9) for the purpose of backup, the associated object ID is common between the home network 5 and the external network 6, so that data can be easily managed. can do. That is, if a copy (backup) of the original file is made to the home network 5 and the external network 6, even if the original file is broken or lost, it is easily desired using the object ID. Can be found on the network. Further, even if a large system such as OSD is not operating, the object of access can be realized and the system can realize its usefulness, and the present invention is supported by a device that does not support the present invention. It can be connected to the same network as the device.

  In the above description, the HDD has been described as the data storage device 4. However, the same processing is possible even with a storage device corresponding to an optical disk such as a CD or a DVD. Further, although an example using the FAT file system as the file system has been shown, any system that manages data as a file may be used. For example, it is used for managing data arrangement information on Unix. It may be an ext file system.

  It should be noted that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

It is a block diagram which shows a part of data recording system in embodiment of this invention. 1 is a block diagram showing an entire data recording system in an embodiment of the present invention. 3 is a diagram showing an LBA space P indicating an address space viewed from the host device 2 and a logical sector space Q indicating an address space viewed from the data recording device 4. FIG. It is a figure which shows an example of FAT. It is a flowchart with which it uses for description about the writing (recording) procedure of the data in the data recording system in embodiment of this invention. It is a figure which shows an example of the register content of the command (Set Write File Parameter) produced | generated at the time of the request | requirement of a recording start cluster number, and a reply. It is a figure which shows an example of the content of SCT and OIT. It is a flowchart with which it uses for description about the change procedure of object ID. It is a figure which shows an example of the register content of the command (Read Attribute) produced | generated when reading object ID. It is a flowchart with which it uses for description about the procedure which changes the object ID which overlaps. It is a figure which shows an example of the register content of the command (Set Attribute) used at the time of change of object ID. It is a figure which shows an example of the register content of the command (Set Read File Parameter) used when reading a file.

Explanation of symbols

1 recording / reproducing system, 2 host device, 3 interface, 4 HDD, 5 home network, 6 external network, 7 TV display device, 8 server, 9 storage system, 11 disk, 12 spindle motor, 13 voice coil motor, 14 servo Control unit, 15 read / write channel unit, 16 hard disk control unit, 17 buffer memory, 18 interface control unit, 19 memory, 20, 32 CPU, 21 bus, 22 nonvolatile solid-state memory

Claims (5)

A data recording device for recording data supplied from one host device connected on a network,
A first table in which a start cluster address which is a data recording start position is registered, and a second table in which the start cluster address and an object number defined on the network are associated and registered are stored. A recording medium having a first system area, a second system area in which a management table in which data connection information is registered is stored, and a user area in which data is stored;
In response to a request from the host device, address information necessary for accessing data recorded in the user area is referred to the second table stored in the first system area. Mode selection means for selecting a second mode referring to the management table stored in the second system area,
When the first mode is selected by the mode selection means, when data is supplied from the host device, a start cluster address which is a recording start position of the supplied data is set to the first area of the user area. First registration means for registering in the table;
When a start cluster address is registered in the first table by the first registration means, an object number is generated, and the generated object number is associated with the start cluster address and registered in the second table. A data recording apparatus comprising the registration means.   The second registration means, when registering the object number in the second table in association with the start cluster address, combines the attribute information of the data recorded in the user area corresponding to the start cluster address. 2. A data recording apparatus according to claim 1, wherein the data recording apparatus is registered. In a data recording system for recording data supplied from one host device connected on a network in a data recording device,
The one data recording apparatus is
A first table in which a start cluster address which is a data recording start position is registered, and a second table in which the start cluster address and an object number defined on the network are associated and registered are stored. A recording medium having a first system area, a second system area in which a management table in which data connection information is registered is stored, and a user area in which data is stored;
In response to a request from the host device, address information necessary for accessing data recorded in the user area is referred to the second table stored in the first system area. Mode selection means for selecting a second mode referring to the management table stored in the second system area,
When the first mode is selected by the mode selection means, when data is supplied from the host device, a start cluster address which is a recording start position of the supplied data is set to the first area of the user area. First registration means for registering in the table;
When a start cluster address is registered in the first table by the first registration means, a second registration means for associating an object number with the start cluster address and registering it in the second table is provided. Data recording system.   The second registration means, when registering the object number in the second table in association with the start cluster address, combines the attribute information of the data recorded in the user area corresponding to the start cluster address. 4. The data recording system according to claim 3, wherein the data recording system is registered. One host device connected to the network is
A reading means for reading a second table stored in a first system area of a recording medium provided in each data recording device when a plurality of data recording devices are connected on the network;
Search means for searching for duplicate object numbers from a plurality of second tables read by the reading means;
An object number changing means for changing the object number registered in the second table so that the object number is different when the object number is found to be duplicated by the search means;
When the object number is changed by the object number changing means, the attribute information changing means for changing the attribute information registered in relation to the object number;
Overwriting to overwrite the second table whose contents have been changed by the object number changing means and the attribute information changing means on the first system area of the recording medium provided in the original data recording apparatus read by the reading means 4. The data recording system according to claim 3, further comprising means.

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