JP2010055139A - Memory controller, non-volatile storage device, access device, and non-volatile memory system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that a large capacity is required for a ROM in an access device to store a program for a file system which analyzes and operates a data structure recorded in a non-volatile memory in order to record data in a non-volatile storage device with a non-volatile memory mounted thereon. <P>SOLUTION: A non-volatile storage device includes a writable address management part for managing a writable region of a non-volatile memory. An access device acquires a logical address in which data can be recorded from the writable address management part. The access device determines a data recording position (address) to the non-volatile storage device based on the acquired logical address, and records the data in the non-volatile memory. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a memory controller, a non-volatile storage device, an access device, and a non-volatile storage system, and particularly relates to a case where the non-volatile memory is an OTP (One Time Programmable) memory.

  In recent years, there are various types of storage devices that store music content and digital data such as video data, such as magnetic disks, optical disks, and magneto-optical disks. Memory cards, which are one type of these storage devices, mainly use non-volatile memories such as flash memories as storage elements and can be miniaturized, so that they can be miniaturized in digital still cameras, mobile phone terminals, video cameras, etc. It is spreading rapidly, especially in mobile devices.

  The data stored in the memory card is managed by a file system, and the user can easily handle the stored data as a file. Conventionally used file systems include a FAT file system (refer to Non-Patent Document 1 for details), a UDF file system (Universal Disk Format) (refer to Non-Patent Document 2 for details), and an NTFS file system (New Technology File). System) and the like exist. Since memory cards in which data is managed by these file systems can share files between devices that interpret the same file system, data can be exchanged between these devices.

On the other hand, in recent years, an OTP (One Time Programmable) memory that can be manufactured at low cost by applying the technology of the conventional CMOS process is attracting attention as a memory element different from the NAND flash memory. The OTP memory has a limitation that it can be written only once to the same physical memory area, but because of its low manufacturing cost, it is used for applications such as long-term storage of data, especially like media such as DVD-R. There is a possibility of spreading as a memory element of a memory card. That is, it is sold as a relatively expensive memory card using a NAND flash memory for applications that require rewriting multiple times, such as a conventional memory card, and rewriting is unnecessary after writing once. By selling it as a relatively inexpensive memory card using an OTP memory, it can be used properly according to user needs. A method of managing file data in a hierarchical directory structure using an OTP memory that can be written only once has also been proposed (for example, Patent Document 1).
JP 2003-196142 A ISO / IEC9293, “Information Technology-Volume and file structure of disk cartridges for information”, 1994 OSTA Universal Disk Format Specification Revision 1.50, 1997

  However, when file data is written in an access device such as a data recording / reproducing device to the above storage (memory) device equipped with the conventional OTP memory, the file data is managed in a hierarchical directory structure, or pseudo- In order to be able to erase and overwrite file data, etc., the access device requires a special file management method, and the ROM capacity of the access device for storing the program becomes large and the cost increases. there were.

  In addition, when a general file system is used for the access device, it is possible to manage the file data in a storage device equipped with an OTP memory with address conversion or a hierarchical directory structure, or to erase or overwrite the file data in a pseudo manner. As a result, the ROM capacity for storing the program and the number of gates of the memory controller are increased, the cost of the storage device is increased, or the power supply to the storage device is suddenly cut off during writing. In some cases, the file system management information is damaged, and other file data cannot be read.

  An object of the present invention is to reduce the ROM capacity for storing a program and the number of gates of a memory controller by simplifying the file management method on the access device side and the processing on the storage device side.

  The present invention relates to a writable address that calculates a logical address corresponding to a physical address at which data can be written to a nonvolatile memory and outputs the logical address to the outside in a memory controller that controls data recording to the nonvolatile memory. A management unit is provided.

  As a result, it is not necessary for the access device side to store a program such as data management recorded in the memory, and the required ROM capacity or the like can be reduced.

  The present invention can also be realized as a non-volatile storage device including the above-described memory controller and a non-volatile memory.

  In this case, the nonvolatile storage device does not need to store a program such as data management recorded in the memory on the access device side, and realizes a nonvolatile storage device capable of reducing the required ROM capacity and the like. It becomes possible to do.

  Furthermore, the present invention relates to an access device connected to a nonvolatile memory device having a nonvolatile memory and a memory controller for controlling the nonvolatile memory, and stores information related to a logical address at which data can be written to the nonvolatile memory. And a file data storage location management unit that holds information and determines a write logical address of data to be newly recorded based on the information.

  In this case, the access device does not require a program such as a file system when writing data to the memory controller or the non-volatile storage device, and an access device with a reduced ROM capacity or the like can be realized. .

  In the invention of the above memory controller, nonvolatile storage device, and access device, the nonvolatile memory is either a nonvolatile memory capable of rewriting data a plurality of times or an OTP memory capable of recording data only once. If it is.

  Thereby, the memory controller, the nonvolatile storage device, the access device, and the like can effectively record data in the nonvolatile memory according to the type of the nonvolatile memory.

  The present invention can also be realized as a nonvolatile storage system including the above-described nonvolatile storage device and access device.

  As described above, according to the memory controller, nonvolatile storage device, and nonvolatile storage system according to the present invention, the file system or the like for the access device to write file data to the nonvolatile storage device having the nonvolatile memory. It is no longer necessary to prepare the program, and the capacity of the ROM for storing necessary programs can be reduced.

(First embodiment)
FIG. 1 is a block diagram showing an implementation method of the nonvolatile memory system in the present embodiment. The non-volatile storage system includes a non-volatile storage device including a non-volatile memory and an access device that issues a request such as data writing to the non-volatile storage device. In FIG. 1, the access device 1 includes a CPU 11, a RAM 12, a storage device interface 13, and a ROM 14. The ROM 14 stores a program for controlling the access device 1, and this program operates on the CPU 11 using the RAM 12 as a temporary storage area. The storage device interface 13 is a connection unit between the nonvolatile storage device 2 and the access device 1, and control signals and data are transmitted and received between the access device 1 and the nonvolatile storage device 2 via the storage device interface 13. The programs recorded in the ROM 14 further include an application control unit 15, a storage device determination unit 16, a file data storage location management unit 17, and a recording device access unit 18.

  The application control unit 15 performs overall control of the access device 1 such as file data generation and power control.

  The storage device determination unit 16 distinguishes the capacity that can be read and written from the nonvolatile storage device 2 connected to the storage device interface 13 and whether the installed nonvolatile memory 27 is an OTP memory or a flash memory. Information and whether or not a control signal and a command for notifying information on an address where file data can be written can be used are obtained and determined.

  The file data storage location management unit 17 acquires logical address and size information to which data can be written from the nonvolatile storage device 2, and assigns the file data from the application control unit 15 to which logical address of the nonvolatile storage device 2. It is determined whether to perform writing, and the information is transferred to the recording device access unit 18.

  The recording device access unit 18 sends commands and files to the nonvolatile storage device 2 through the storage device interface 13 based on the file data, size, and write logical address information passed from the file data storage location management unit 17. Control sending and receiving data.

  On the other hand, in FIG. 1, the nonvolatile memory device 2 includes a memory controller 25 and a nonvolatile memory 27.

  The memory controller 25 includes a host interface unit (hereinafter referred to as a host I / F unit) 250, an address management unit 251, a memory access unit 252, a storage device information notification unit 253, and a writable address management unit 254. Including.

  The host I / F unit 250 is an interface that transmits and receives control signals, file data, various information, commands, and the like to and from the access device 1.

  The address management unit 251 provides a function of converting file data and various types of information from the access device 1 to a physical address of the mounted nonvolatile memory 27 from a specified logical address.

  The memory access unit 252 provides a function of physically reading / writing data from / to the nonvolatile memory 27 from a logical address designated for reading / writing file data and various information from the access device 1.

  The storage device information notification unit 253 provides a function of notifying information of the nonvolatile storage device 2, and specifically, information that a control signal and a command for notifying information of a writable logical address can be used. And information for distinguishing whether the mounted non-volatile memory 27 is an OTP memory or a flash memory, and information on a capacity capable of reading and writing.

  The writable address management unit 254 provides a function of detecting a writable logical address and its size from the nonvolatile memory 27 and notifying the access device 1 of the information.

  The nonvolatile memory 27 is a storage area 271 that constitutes a logical address space for storing file data, file system management information, and the like, and information that manages the correspondence between the logical address and the physical address of the data stored in the storage area 271 And an address management information storage unit 272 that stores information indicating whether or not the storage area has been used.

  The nonvolatile memory system of the present invention configured as described above will be described. First, a processing procedure when the access device 1 writes file data to the nonvolatile storage device 2 will be described with reference to FIG.

  In S201, the access device 1 transmits a storage device information acquisition command for acquiring information of the connected storage device to the nonvolatile storage device 2.

  In S202, information that a command for notifying information of a writable logical address can be used as storage device information from the nonvolatile storage device 2, the type of the mounted nonvolatile memory, and the maximum readable / writable value Capacity information is returned.

  In S <b> 203, the access device 1 determines that a command for knowing information on logical addresses that can be written by the storage device determination unit 16 can be used.

  In S204, a writable address information acquisition command for knowing information of writable logical addresses is transmitted to the nonvolatile memory device 2.

  In S205, the non-volatile storage device 2 receives the writable address information acquisition command, and the writable address management unit 254 detects the writable logical address and its size from the non-volatile memory 27, and Information is passed to the host I / F unit 250.

  In S206, the logical address that can be written to the access device 1 and its size are returned through the host I / F unit 250 of the nonvolatile storage device 2, and the file data storage location management unit 17 manages them.

  In S207, the file data received from the application control unit 15 of the access device 1 is written from the logical address and the size information that the file data storage location management unit 17 can write to the nonvolatile storage device 2. Determine the logical address to be performed.

  In S208, the recording device access unit 18 designates a logical address and a size to be written, transmits a command to the nonvolatile storage device 2 through the storage device interface 13, and writes file data.

  In S209, the nonvolatile storage device 2 converts the received file data from a logical address designated by the address management unit 251 to a physical address, and writes it in the nonvolatile memory 27 by the memory access unit 252.

  Although the present invention has been described based on the above embodiment, it is needless to say that the present invention is not limited to the above embodiment. Various modifications can be made without departing from the spirit of the present invention. For example, in this embodiment, S201 to S209 are executed in order, but when the nonvolatile storage device 2 is attached to the access device 1, S201 to S206 are executed, and S207 to S209 are file. It may be performed when data is generated, or a write command may be repeatedly transmitted as necessary. In addition, when acquiring writable address information, size information is also acquired in addition to the address. For this size information, an agreement can be made in advance between the nonvolatile storage device and the access device. If not, it is not necessary.

  According to the present embodiment, the access device 1 can determine a logical address for recording file data on the basis of writable address information acquired from the nonvolatile storage device 2, so that a file system or the like is prepared for the access device 1. This eliminates the need to reduce the ROM capacity for storing the program.

  In the present embodiment, since the access device 1 records only data in the data area and does not record data management information, even if the power source of the nonvolatile storage device 2 is cut off suddenly, the file system or the like The file management information is not damaged, and other file data cannot be read.

(Second Embodiment)
In the present embodiment, even when the file system exists, the same effect can be obtained by reducing the capacity of the ROM storing the program and the number of gates of the memory controller by processing in the same manner. Furthermore, it becomes possible to read with another access device such as a personal computer capable of handling the file system, and the convenience can be improved.

  FIG. 3 is a diagram illustrating an example of a state in which the nonvolatile storage device 2 is formatted with the FAT file system. The secured FATs 1041, 1042, 1043, and 1044 constitute cluster chains corresponding to the data areas 1011, 1012, 1013, and 1014, respectively. The reserved directory entries 1051, 1052, 1053, and 1054 have the start cluster, size information, and file name of the data areas 1011, 1012, 1013, and 1014, respectively.

  FIG. 4 is an example showing the state of the logical address space and physical address space of the nonvolatile memory 27 in the state of FIG. The secured FATs 1041, 1042, 1043, and 1044 are stored in the storage area 271, and are stored as logical address information in the address management information enabling unit 272 as A010, A020, A030, and A040, respectively.

  Since the reserved directory entry is as small as 32 bytes in the FAT file system, the reserved directory entries 1051 to 1054 are stored from the logical address information A050.

  Next, a processing procedure before mounting the nonvolatile memory device 2 on the access device 1 will be described with reference to FIG.

  Before mounting the access device 1 in S501, an FS management information write command is transmitted to the nonvolatile storage device 2 using the inspection device used in the inspection process at the factory, and FIGS. The file system management information (FS management information) such as the master boot record, the partition boot sector, the FAT, and the directory entry is written so that the state becomes.

  In S502, the non-volatile storage device 2 stores the sent FS management information in the non-volatile memory 27, and sets the states shown in FIGS.

  In S503, the inspection device transmits a writable address information setting command to the nonvolatile storage device 2, and starts the data area for writing the file data that matches the FAT and directory entry written in S501. Write logical address and size information. For example, in the case of FIG. 3, the start logical address A100 of the data area 1011 and its size 100 clusters, the start logical address A200 of the data area 1012, its size 100 clusters, the start logical address A300 of the data area 1013, and its size Information of 100 clusters and the start logical address A400 of the data area 1014 and its size 100 clusters are written.

  In S504, the nonvolatile storage device 2 stores the sent writable logical address information in the nonvolatile memory 27.

  Up to this point, the processing before being attached to the access device 1 is completed. Next, a procedure after the above-described nonvolatile memory device 2 is mounted on the access device 1 will be described. Steps S201 to S204 are the same as those in the first embodiment, and a description thereof will be omitted.

  In S505, the non-volatile storage device 2 receives the writable address information acquisition command, and the writable address management unit 254 detects a writable logical address and its size from the non-volatile memory 27. Information is passed to the host I / F unit 250. Specifically, it is information on the start logical address and size of the data area sent from the inspection apparatus in S0903. In the case of FIG. 3, the start logical address A100 of the data area 1011 and its size 100 cluster, The start logical address A200 of the data area 1012, its size 100 clusters, the start logical address A300 of the data area 1013, its size 100 clusters, the start logical address A400 of the data area 1014, and its size 100 clusters are the host I / F part. 250.

  In S 506, an address that can be written to the access device 1 and its size are returned through the host I / F unit 250 of the nonvolatile storage device 2.

  In S507, the file data received from the application control unit 15 of the access device 1 is written from the logical address and the size information that can be written to the nonvolatile storage device 2 by the file data storage location management unit 17. The logical address to perform is determined. For example, in the case of FIG. 3, it is determined to write the start logical address A100 of the data area 1011 and the file data size 100 clusters.

  In S508, the recording device access unit 18 designates the logical address and size to be written, transmits a command to the nonvolatile storage device 2 through the storage device interface 13, and writes the file data.

  In S509, the non-volatile storage device 2 receives the file data and the logical address to be written through the host I / F unit 250. For the received file data, an appropriate physical address is determined by the address management unit 251, and physical writing is performed in the nonvolatile memory 27 through the memory access unit 252. For example, if the state of the nonvolatile memory 27 before the writing in S509 is the state of FIG. 4, the state shown in FIG. 6 is obtained by writing the file data.

  According to the present embodiment, the access device 1 can determine a logical address for recording file data on the basis of writable address information acquired from the nonvolatile storage device 2, so that a file system or the like is prepared for the access device 1. This eliminates the need to reduce the ROM capacity for storing the program.

  In addition, according to the present embodiment, the access device 1 acquires address information from which data can be written to the nonvolatile storage device 2 even when data recorded in accordance with the rules of the file system exists in the nonvolatile storage device 2. Thus, since the logical address for recording data can be determined according to the rules of the file system, the capacity of the ROM for storing the program of the access device 1 can be reduced. In this case, even when the nonvolatile storage device 2 is installed in another access device such as a personal computer that can handle the file system, the FAT, the directory entry, and the logical address of the written file data are consistent. Therefore, it can be read as file data, and the convenience can be improved.

  In the present embodiment, since the access device 1 records only data in the data area and does not record data management information, even if the power source of the nonvolatile storage device 2 is cut off suddenly, the file system or the like The file management information is not damaged, and other file data cannot be read.

  Although the present invention has been described based on the above embodiment, it is needless to say that the present invention is not limited to the above embodiment. Various modifications can be made without departing from the spirit of the present invention. The numerical values used in the present embodiment are examples, and other numerical values may be used. For example, in FIG. 3, FIG. 4, and FIG. 6, the reserved FAT, the reserved directory entry, and the data area are divided into four, and the logical address, physical address, and size are described as specific numerical values. It is desirable to set the optimum value for the size of the file data generated by the application control unit in the access device 1, and there is no particular significance in limiting it. In S501 and S503, a factory inspection device is used. However, the device is not limited to a writing location or a device name, and a personal computer or other device may be used as long as it has a file system.

(Third embodiment)
FIG. 7 is a block diagram showing a method for implementing the nonvolatile memory system in the embodiment of the present invention. The configuration shown in the embodiment of FIG. 1 is different in that the writable address management unit 254 does not exist in the memory controller 25 of the nonvolatile memory device 2.

  Therefore, the file data storage location management unit 17 of the access device 1 transmits a file data read command to the nonvolatile storage device 2, reads the file data, checks the contents of the file data, and determines whether or not the file data has been written. By making a determination and repeating it as necessary, a writable logical address is grasped and managed. Further, the logical address of the nonvolatile storage device 2 to which the file data from the application control unit 15 is written is determined, and the information is passed to the recording device access unit 18.

  The storage device information notification unit 253 of the nonvolatile storage device 2 provides a function of notifying information of the nonvolatile storage device 2, and specifically, whether the mounted nonvolatile memory 27 is an OTP memory or a flash memory. Information for discriminating whether or not the information is available, and information on the capacity that can be read and written.

  A processing procedure of the nonvolatile storage system of the present embodiment configured as described above will be described. Similar to the second embodiment, the processing procedure can be roughly divided into two processes: a process before mounting the nonvolatile memory device 2 to the access device 1 and a process after mounting. First, a procedure for processing before the nonvolatile storage device 2 is mounted on the access device 1 will be described.

  Before mounting the access device 1 in S801, an FS management information write command is transmitted to the non-volatile storage device 2 using the inspection device used in the inspection process at the factory, and FIGS. The file system management information (FS management information) such as the master boot record, the partition boot sector, the FAT, and the directory entry is written so that the state becomes.

  In S802, the non-volatile storage device 2 stores the sent FS management information in the non-volatile memory 27, and sets the states shown in FIGS. Since the states of FIGS. 3 and 4 are the same as those of the second embodiment, description thereof is omitted. The processing up to this point is the processing before being attached to the access device 1. The following processing is performed after the access device 1 is mounted.

  In step S <b> 803, the access device 1 transmits a storage device information acquisition command for acquiring information of the connected storage device to the nonvolatile storage device 2.

  In S804, the type of the nonvolatile memory mounted as the storage device information and the maximum capacity information that can be read and written are returned from the nonvolatile storage device 2.

  In S805, the access device 1 needs to determine that the command for knowing the information of the writable logical address by the storage device determination unit 16 cannot be used, and to grasp the writable logical address by another method. Judge that there is.

  In S806, as a method of grasping the writable logical address, a file data read command for reading file data of the logical address decided in advance is transmitted from the capacity information that can be read and written in the nonvolatile storage device 2.

  In S807, the file data of the designated logical address is returned from the non-volatile storage device 2.

  In step S808, the file data storage location management unit 17 of the access device 1 confirms the contents of the file data and determines whether the data has been written. If necessary, S806 to S808 are repeatedly performed to grasp the writable logical address and its size. Specifically, it is the logical address information of the file data indicated by the directory entry information written as file system management information by the inspection apparatus in S801. In the case of FIG. 3, the start logical address A100 of the data area 1011 is The start logical address A200 of the size 100 cluster and the data area 1012, the start logical address A300 of the size 100 cluster and the data area 1013, the start logical address A400 of the size 100 cluster and the data area 1014, and the size 100 cluster. Know that it is.

  In step S809, the file data received from the application control unit 15 of the access device 1 is written from the logical address that can be written to the nonvolatile storage device 2 by the file data storage location management unit 17 and the size information. Determine the logical address to be performed. For example, in the case of FIG. 3, it is determined to write the start logical address A100 of the data area 1011 and the file data size 100 clusters.

  In S0810, the recording device access unit 18 designates a logical address and size to be written, transmits a command to the nonvolatile storage device 2 through the storage device interface 13, and writes file data.

  In S0811, the file data and the logical address to be written are received through the host I / F unit 250 of the nonvolatile memory device 2. For the received file data, an appropriate physical address is determined by the address management unit 251, and physical writing is performed in the nonvolatile memory 27 through the memory access unit 252. For example, if the state of the non-volatile memory 27 before the writing in S811 is the state of FIG. 4, the state shown in FIG. 6 is obtained by writing the file data.

  According to the present embodiment, even if the access device 1 does not include a file system or the like, it becomes possible to write data to the nonvolatile storage device 2 and the like of the access device 1 for storing a program such as a file system. ROM capacity can be reduced. That is, the ROM capacity of the access device 1 can be reduced without the writable address management unit 254 in the nonvolatile storage device 2.

  Further, according to the present embodiment, even when data recorded in accordance with the file system rules exists in the nonvolatile storage device 2, the access device 1 determines a logical address for recording data in accordance with the file system rules. Therefore, the ROM capacity for storing the program of the access device 1 can be reduced. In this case, even when the nonvolatile storage device 2 is installed in another access device such as a personal computer that can handle the file system, the FAT, the directory entry, and the logical address of the written file data are consistent. Therefore, it can be read as file data, and the convenience can be improved.

  In the present embodiment, since the access device 1 records only data in the data area and does not record data management information, even if the power source of the nonvolatile storage device 2 is cut off suddenly, the file system or the like The file management information is not damaged, and other file data cannot be read.

  Although the present invention has been described based on the above embodiment, it is needless to say that the present invention is not limited to the above embodiment. Various modifications can be made without departing from the spirit of the present invention. The numerical values used in the present embodiment are examples, and other numerical values may be used. For example, in FIG. 3, FIG. 4, and FIG. 6, the reserved FAT, the reserved directory entry, and the data area are divided into four, and the logical address, physical address, and size are described as specific numerical values. It is desirable to set the optimum value for the size of the file data generated by the application control unit in the access device 1, and there is no particular significance in limiting it. In S801, the inspection apparatus at the factory is used. However, the apparatus is not limited to the writing location and the apparatus name, and may be a personal computer or other apparatus as long as it has a file system.

  In the first, second, and third embodiments, the nonvolatile memory is not only a nonvolatile memory that can be rewritten a plurality of times but also an OTP memory that records data only once. There may be. In this case, since the access device grasps the capacity that can be recorded in the nonvolatile storage device (nonvolatile memory) and performs data recording, the present invention makes it possible to effectively record data in the OTP. .

  The nonvolatile storage system according to the present invention reduces the ROM capacity and the number of gates of the memory controller for storing necessary programs by simplifying the file management method on the access device side and the processing on the storage device side. Therefore, it is proposed to provide an inexpensive non-volatile storage system. Such an access device is useful as a simple still image recording / reproducing device or moving image recording / reproducing device.

The block diagram which shows the structure of the non-volatile storage system in 1st, 2nd embodiment The figure explaining the process sequence in 1st Embodiment The figure which shows the logical address space of the non-volatile memory which written the data of FAT file system by the test | inspection apparatus in 2nd, 3rd embodiment The figure which shows a response | compatibility with the logical address space of the non-volatile memory which written the data of FAT file system by the test | inspection apparatus in 2nd, 3rd Embodiment, and physical address space The figure explaining the process sequence in 2nd Embodiment The figure which shows a response | compatibility with the logical address space of the non-volatile memory after writing the file data by the access apparatus in 2nd, 3rd Embodiment, and physical address space The block diagram which shows the structure of the non-volatile storage system in 3rd Embodiment The figure explaining the process sequence in 3rd Embodiment

Explanation of symbols

1 Access device 2 Non-volatile storage device 11 CPU
12 RAM
13 Storage device interface 14 ROM
DESCRIPTION OF SYMBOLS 15 Application control part 16 Storage device determination part 17 File data storage location management part 18 Recording device access part 25 Memory controller 27 Non-volatile memory 100 Management information area 101 Data area 102 Master boot record partition table 103 Partition boot sector 104 FAT
105 Directory entry 250 Host I / F unit 251 Address management unit 252 Memory access unit 253 Storage device information notification unit 254 Writable address management unit 271 Storage area 272 Address management information storage unit

Claims (7)

In a memory controller that controls data recording to a nonvolatile memory,
A memory controller comprising a writable address management unit that calculates a logical address corresponding to a physical address at which data can be written to the nonvolatile memory and outputs the logical address to the outside. The memory controller of claim 1,
The memory controller, wherein the nonvolatile memory is either a nonvolatile memory capable of rewriting data a plurality of times or an OTP memory capable of recording data only once. A memory controller according to claim 1;
A non-volatile storage device comprising: a non-volatile memory controlled by the memory controller. The non-volatile memory device according to claim 3,
The nonvolatile memory device is characterized in that the nonvolatile memory is either a nonvolatile memory capable of rewriting data a plurality of times or an OTP memory capable of recording data only once. In an access device connected to a nonvolatile memory device including a nonvolatile memory and a memory controller that controls the nonvolatile memory,
A storage device interface unit for acquiring information related to a logical address in which data can be written to the nonvolatile memory from the nonvolatile storage device;
An access device comprising: a file data storage location management unit that holds the information and determines a write logical address of data to be newly recorded based on the information. The access device according to claim 4,
An access device, wherein the nonvolatile memory is either a nonvolatile memory capable of rewriting data a plurality of times, or an OTP memory capable of recording data only once. A nonvolatile storage system comprising: the nonvolatile storage device according to claim 3; and the access device according to claim 5.

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