CN106024046B - Date storage method and device - Google Patents
Date storage method and device Download PDFInfo
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- CN106024046B CN106024046B CN201610353258.9A CN201610353258A CN106024046B CN 106024046 B CN106024046 B CN 106024046B CN 201610353258 A CN201610353258 A CN 201610353258A CN 106024046 B CN106024046 B CN 106024046B
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C7/00—Arrangements for writing information into, or reading information out from, a digital store
- G11C7/10—Input/output [I/O] data interface arrangements, e.g. I/O data control circuits, I/O data buffers
- G11C7/1006—Data managing, e.g. manipulating data before writing or reading out, data bus switches or control circuits therefor
Abstract
The invention discloses a kind of date storage method, when the date storage method includes: the modification instruction that movable storage device detects data file, determine that the modification instructs corresponding data file；Determine cluster number of the data file in preset file directory table；When cluster number of the data file in the file directory table is more forward than current markers cluster number, the modification is forbidden to instruct corresponding modification operation, wherein, the current markers cluster number is determined when the movable storage device is powered on according to the maximum critical point of the effectively cluster number of the maximum before powering on.Invention also discloses a kind of data storage device.The present invention improves the safety of data storage.
Description
Technical field
The present invention relates to field of data storage more particularly to a kind of date storage methods and device.
Background technique
With the development of science and technology, the requirement in field of data storage to data storage is also higher and higher, at present logarithm
According to storage, typically by movable storage device for example USB flash disk, terminal hard disk or cloud cloud disk etc. carry out data storage.Mesh
After storing data, user can modify to the data stored in USB flash disk preceding common USB flash disk on the market after the power-up, cause non-
Method user can modify to the data in USB flash disk after taking USB flash disk by illegal means, lower to the safety of data storage.
Summary of the invention
It is a primary object of the present invention to propose a kind of date storage method and device, it is intended to solve traditional data storage
Mode, the lower technical problem of safety.
To achieve the above object, a kind of date storage method provided by the invention, the date storage method include:
When movable storage device detects the modification instruction of data file, determine that the modification instructs corresponding data text
Part；
Determine cluster number of the data file in preset file directory table；
When cluster number of the data file in the file directory table is more forward than current markers cluster number, forbid described repair
Change the corresponding modification of instruction to operate, wherein the current markers cluster number when the movable storage device is powered on according to powering on before
Maximum effectively cluster number maximum critical point determine.
Preferably, when the movable storage device detects the modification instruction of data file, the modification instruction pair is determined
Before the step of data file answered, the date storage method further include:
When the movable storage device powers on, scanning the maximum recorded in the file directory table by flash translation layer (FTL) has
Imitate cluster number；
Using the maximum critical point of the maximum effectively cluster number as current markers cluster number.
Preferably, described when cluster number of the data file in the file directory table is more forward than current markers cluster number
When, after the step of forbidding the modification that corresponding modification is instructed to operate, the date storage method further include:
When the movable storage device detects the write instruction of data file, institute is written in preset file allocation table
Data file is stated, and records the identification information and data file occupancy of the data file in the file directory table
Cluster number；
If detecting cut-offing instruction, the data file is stored.
Preferably, the movable storage device is written in preset file allocation table after the data file, by institute
File allocation table is stated to make a backup store.
Preferably, it is described after the determination data file is the cluster number in preset file directory table the step of
Date storage method further include:
When cluster number of the data file in the file directory table rearward than current markers cluster number when, repaired according to described
Change instruction to modify to the data file.
In addition, to achieve the above object, the present invention also proposes a kind of data storage device, the data storage device packet
It includes:
First determining module when for detecting that the modification of data file instructs, determines that the modification instructs corresponding number
According to file；
Second determining module, for determining cluster number of the data file in preset file directory table；
Disabled module, it is more forward than current markers cluster number for working as cluster number of the data file in the file directory table
When, forbid the modification to instruct corresponding modification operation, wherein the current markers cluster number is powered in the movable storage device
When according to before powering on maximum effectively cluster number maximum critical point determine.
Preferably, the data storage device further include:
Scan module when powering on for the movable storage device, scans the file directory table by flash translation layer (FTL)
The effective cluster number of maximum of middle record；
First processing module, for using the maximum critical point of the maximum effectively cluster number as current markers cluster number.
Preferably, the data storage device further include:
Second processing module when being also used to detect the write instruction of data file, is write in preset file allocation table
Enter the data file, and record in the file directory table data file identification information and the data file
The cluster number of occupancy；
Memory module, if storing the data file for detecting cut-offing instruction.
Preferably, the memory module is also used to be written after the data file in preset file allocation table, will
The file allocation table makes a backup store.
Preferably, the data storage device further include:
Modified module, for working as cluster number of the data file in the file directory table rearward than current markers cluster number
When, it is modified according to modification instruction to the data file.
Date storage method and device proposed by the present invention, movable storage device detect the modification instruction of data file
When, it first determines that the modification instructs corresponding data file, then determines the data file in preset file directory table
Cluster number forbid described if cluster number of the data file in the file directory table is more forward than current markers cluster number
Modification instructs corresponding modification to operate, wherein the current markers cluster number is when the movable storage device is powered on according to powering on
The maximum critical point of preceding maximum effectively cluster number determines, realizes after the movable storage device re-powers, before powering on
Data with regard to persistence, be not modified, rather than as traditional movable storage device can modify data at any time, to protect
The safety of data storage is demonstrate,proved.
Detailed description of the invention
Fig. 1 is the flow diagram of date storage method first embodiment of the present invention；
Fig. 2 is the flow diagram of date storage method second embodiment of the present invention；
Fig. 3 is the flow diagram of date storage method 3rd embodiment of the present invention；
Fig. 4 is the functional block diagram of data storage device first embodiment of the present invention；
Fig. 5 is the functional block diagram of data storage device second embodiment of the present invention；
Fig. 6 is the functional block diagram of data storage device 3rd embodiment of the present invention.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
The present invention provides a kind of date storage method.
Referring to Fig.1, Fig. 1 is the flow diagram of date storage method first embodiment of the present invention.
The present embodiment proposes that a kind of date storage method, the date storage method include:
Step S10 when movable storage device detects the modification instruction of data file, determines that the modification instruction is corresponding
Data file；
In the present embodiment, before the step S10, the date storage method is further comprised the steps of:
When the movable storage device powers on, scanning the maximum recorded in the file directory table by flash translation layer (FTL) has
Imitate cluster number；
Using the maximum critical point of the maximum effectively cluster number as current markers cluster number.
Firstly, movable storage device is equipped with FAT (File Allocation Table, file configuration table) file system
System, and the FAT file system includes each area, such as MBR (Main Boot Record, master boot record area) area, DBR
(Dos Boot Record, dos boot record area) area, the area FDT (File Directory Table, file directory
Table), (File Allocation Table, the file allocation table) area FAT and DADT (user data area) area etc., and FDT table
In, logical start address can be production tool initialization, and also area calculates and learns in the area Ke Cong MBR and DBR, and described
The major function of FDT table is to record the information of all data files in the movable storage device (including filename, file are big
It is small, the information such as file address, file date).And known before powering on by scanning the FDT table, data file is assigned to described
In which position of FDT table, wherein the information of each data file has defined format in the FDT table, passes through phase obstruction and rejection
Whether formula scans with the presence of file, and specific format is not described in detail here, also, the FTL in the movable storage device
(Flash translation layer, flash translation layer (FTL)) module is used to record the position letter of this last valid data file
The location information of breath, the last effective data file actually refers to the maximum data file of cluster number in the FDT table
Cluster number, i.e., maximum effective cluster number.In the present embodiment, the FAT table is for storing each data file, each data file
It is successively to store the FAT table sequentially in time, also, due to the pipe of the FAT table in the FAT file system
Reason unit is cluster, and the dividing unit of each cluster is 2nA byte, wherein 2≤n≤9, therefore it is each in the FAT table
Corresponding minimum 4 bytes of byte of a cluster successively can be 8 bytes, 16 bytes, and maximum byte is 512 bytes,
It therefore, is successively to store the byte number that each data file occupies when successively storing each data file in the FAT table
To the FAT table, in the present embodiment, each of FAT table cluster can be all divided into 4 bytes, even if there are data literary
Less than 4 bytes of the capability value of part, it is also desirable to a byte is occupied, if the capability value for having data file is 4.1 bytes, then
The data file needs to occupy two bytes at this time, and after each byte divides, cluster number is also determination, therefore, is being incited somebody to action
When each data file is written in the FAT table, that is, it can determine the cluster number of each data file, it should be appreciated that this programme
In the corresponding cluster number of each data file be substantially cluster number section.
Therefore, in the present embodiment, when the storage of each data file is to the movable storage device, the movable storage device
It can record the cluster number of each data file, when the subsequent movable storage device powers on, first pass through flash translation layer (FTL) FTL module
Scan the effective cluster number of maximum recorded in the file directory table, then using the maximum critical point of the maximum effectively cluster number as
Current markers cluster number.
In the present embodiment, the movable storage device detect data file modification instruction when, first determine described in repair
Change the corresponding data file of instruction.
Step S20 determines cluster number of the data file in preset file directory table；
After determining that the modification instructs corresponding data file, determine the data file in preset file directory
Cluster number in table.
Step S30 prohibits when cluster number of the data file in the file directory table is more forward than current markers cluster number
Only the modification instructs corresponding modification operation, wherein current markers cluster number root when the movable storage device powers on
It is determined according to the maximum critical point of the effectively cluster number of the maximum before powering on.
The data file is being determined after the cluster number in the file directory table, by the data file in the text
Cluster number in part catalogue listing is compared with current markers cluster number, since the current markers cluster number is the movable storage device
When powering on, the effective cluster number of maximum that flash translation layer (FTL) scans in the file directory table, and according to maximum effectively cluster number
What maximum critical point determined, therefore, when cluster number of the data file in the file directory table is leaned on than current markers cluster number
When preceding, illustrating the time of the data file earlier than the current markers cluster number, i.e., the described data file is legacy data, because
This, forbids the modification to instruct corresponding modification operation.
The date storage method that the present embodiment proposes, when movable storage device detects the modification instruction of data file, first
It determines that the modification instructs corresponding data file, then determines cluster of the data file in preset file directory table
Number, if cluster number of the data file in the file directory table is more forward than current markers cluster number, forbid the modification
Instruct corresponding modification to operate, wherein the current markers cluster number when the movable storage device is powered on according to powering on before
The maximum critical point of maximum effectively cluster number determines, realizes after the movable storage device re-powers, the number before powering on
According to regard to persistence, it is not modified, rather than as traditional movable storage device can modify data at any time, to ensure that
The safety of data storage.Further, tradition is not modified in order to protect data, stores number using enciphered mobile storage apparatus
According to, since movable storage device uses some complicated encryption technologies, so that cost improves, and in the present embodiment, without using
Enciphered mobile storage apparatus storing data can also reduce the cost of data storage.
Further, in order to improve the flexibility that data store, data storage side of the present invention is proposed based on first embodiment
The second embodiment of method, in the present embodiment, after reference Fig. 2, the step S30, the date storage method further include:
Step S40, when the movable storage device detects the write instruction of data file, in preset file allocation table
The middle write-in data file, and record in the file directory table data file identification information and the data
The cluster number that file occupies；
In the present embodiment, when the movable storage device detects the write instruction of data file, first in the file
The data content of the data file is written in allocation table, that is, FAT table, is then write in said write file directory table, that is, FDT table
Enter the identification information of the data file, such as filename, and records the occupied cluster of the data file in the FDT table
Number, the information such as the write time of the data file are finally updated in the FDT table.
Step S50 stores the data file if detecting cut-offing instruction.
Further, it after the step S50, further comprises the steps of: and is updated to the cluster number of the data file most
Big effective cluster number.
It is understood that when movable storage device is written in data file, even if the cluster number for the data file being newly written
Than the data file being written before cluster number rearward, but since the movable storage device does not power off, at this point, the number being newly written
Can also be modified according to file, therefore, in the file directory table maximum effectively cluster number be still last time power-off before most
Big effective cluster number, and be written at this after new data file, and when movable storage device power-off, it is just that this is new
The cluster number of the data file of write-in is updated to the effective cluster number of maximum of the file directory table.
It is of course also possible to directly store the data file detecting cut-offing instruction.And when re-powering next time,
The effective cluster number of maximum recorded in the file directory table is just scanned by the flash translation layer (FTL).
Further, the movable storage device is written in preset file allocation table after the data file, will
The file allocation table makes a backup store.
In the present embodiment, the data file is written after the file allocation table in order to prevent, for some reason
Loss of data occurs, therefore, the movable storage device is written in preset file allocation table after the data file, will
The file allocation table makes a backup store, and when losing in order to data file, the data file of backup storage can be used.
In the present embodiment, after data file write-in, if if the movable storage device is not sent out and powered off at this time,
The operation such as can modify to the data file file of write-in, delete, add, at this time the current mark in the FDT table
Remember cluster number, is still generates according to powering on maximum cluster number in foregoing description FDT table, it will not be literary due to this new write-in data
Part and change.And when the movable storage device detects cut-offing instruction, at this point, storing the data being written after this is powered on
File, and by the cluster number of the data file of this write-in be updated to maximum effectively cluster number, it is worth noting that, if this
Secondary to have multiple data files that the movable storage device is written, then the cluster number for the data file the last one in this being written is more
New is maximum effective cluster number.
In the present embodiment, after powering on, the data file in movable storage device can be read, but cannot be repaired
Change or deletes, and after the power-up, data file can newly be written in movable storage device, in the case where not power down, newly write
The data file entered can be modified and be deleted, and after power down re-powers, the data being newly written before will be protected
Come, cannot be modified and be deleted, in the present embodiment, front and back is powered on by the movable storage device, old number can be distinguished
According to file and new data file, prevent the legacy data file of storage from being modified, to realize the protection to data file.
Further, in order to improve the flexibility that data store, data of the present invention are proposed based on first or second embodiments
The 3rd embodiment of storage method, in the present embodiment, after reference Fig. 3, the step S20, the date storage method is also
Include:
Step S60, when cluster number of the data file in the file directory table rearward than current markers cluster number when, root
It modifies according to modification instruction to the data file.
In the present embodiment, the cluster number when the data file in the file directory table is rearward than current markers cluster number
When, illustrate that the data file currently read is the data file being newly written after this is powered on, it therefore, can be to the data text
Part is modified, and after being equivalent to write-in new data file, wants to modify data before power down (moving disk), or deleting data all is to allow
, without that can not be modified once write-in data preservation, to improve the flexibility of data storage.
The present invention further provides a kind of data storage devices.
It is the functional block diagram of data storage device first embodiment of the present invention referring to Fig. 4, Fig. 4.
It is emphasized that it will be apparent to those skilled in the art that functional block diagram shown in Fig. 4 is only one preferably real
The exemplary diagram of example is applied, those skilled in the art surrounds the functional module of data storage device shown in Fig. 4, can carry out easily new
Functional module supplement；The title of each functional module is self-defined title, is only used for auxiliary and understands the data storage device
Each program function block is not used in restriction technical solution of the present invention, and the core of technical solution of the present invention is each self-defined title
The function to be reached of functional module.
The present embodiment proposes that a kind of data storage device, the data storage device include:
First determining module 10 when for detecting that the modification of data file instructs, determines that the modification instruction is corresponding
Data file；
Second determining module 20, for determining cluster number of the data file in preset file directory table；
Disabled module 30, for being leaned on when cluster number of the data file in the file directory table than current markers cluster number
When preceding, the modification is forbidden to instruct corresponding modification operation, wherein the current markers cluster number is on the movable storage device
It is determined when electric according to the maximum critical point of the effectively cluster number of the maximum before powering on.
In the present embodiment, the generation of the current markers cluster number has presetting module generation, and the presetting module includes sweeping
Retouch module and first processing module；
The scan module when powering on for the movable storage device, scans the file mesh by flash translation layer (FTL)
The effective cluster number of maximum recorded in record table；
The first processing module, for using the maximum critical point of the maximum effectively cluster number as current markers cluster number.
Firstly, movable storage device is equipped with FAT (File Allocation Table, file configuration table) file system
System, and the FAT file system includes each area, such as MBR (Main Boot Record, master boot record area) area, DBR
(Dos Boot Record, dos boot record area) area, the area FDT (File Directory Table, file directory
Table), (File Allocation Table, the file allocation table) area FAT and DADT (user data area) area etc., and FDT table
In, logical start address can be production tool initialization, and also area calculates and learns in the area Ke Cong MBR and DBR, and described
The major function of FDT table is to record the information of all data files in the movable storage device (including filename, file are big
It is small, the information such as file address, file date).And known before powering on by scanning the FDT table, data file is assigned to described
In which position of FDT table, wherein the information of each data file has defined format in the FDT table, passes through phase obstruction and rejection
Whether formula scans with the presence of file, and specific format is not described in detail here, also, the FTL in the movable storage device
(Flash translation layer, flash translation layer (FTL)) module is used to record the position letter of this last valid data file
The location information of breath, the last effective data file actually refers to the maximum data file of cluster number in the FDT table
Cluster number, i.e., maximum effective cluster number.In the present embodiment, the FAT table is for storing each data file, each data file
It is successively to store the FAT table sequentially in time, also, due to the pipe of the FAT table in the FAT file system
Reason unit is cluster, and the dividing unit of each cluster is 2nA byte, wherein 2≤n≤9, therefore it is each in the FAT table
Corresponding minimum 4 bytes of byte of a cluster successively can be 8 bytes, 16 bytes, and maximum byte is 5124 bytes,
It therefore, is successively to store the byte number that each data file occupies when successively storing each data file in the FAT table
To the FAT table, in the present embodiment, each of FAT table cluster can be all divided into 4 bytes, even if there are data literary
Less than 4 bytes of the capability value of part, it is also desirable to a byte is occupied, if the capability value for having data file is 4.1 bytes, then
The data file needs to occupy two bytes at this time, and after each byte divides, cluster number is also determination, therefore, is being incited somebody to action
When each data file is written in the FAT table, that is, it can determine the cluster number of each data file, it should be appreciated that this programme
In the corresponding cluster number of each data file be substantially cluster number section.
Therefore, in the present embodiment, when the storage of each data file is to the movable storage device, that is, each data be can record
The cluster number of file, when the subsequent movable storage device powers on, the scan module first passes through flash translation layer (FTL) FTL module scans
The effective cluster number of maximum recorded in the file directory table, then the first processing module by the maximum effectively cluster number most
Big critical point is as current markers cluster number.
In the present embodiment, first determining module 10 detect data file modification instruction when, first determine described in
Modification instructs corresponding data file.
After first determining module 10 determines that the modification instructs corresponding data file, described second determines mould
Block 20 determines cluster number of the data file in preset file directory table.
The data file is determined after the cluster number in the file directory table in second determining module 20, by institute
It states cluster number of the data file in the file directory table to be compared with current markers cluster number, due to the current markers cluster number
When being that the movable storage device powers on, the effective cluster number of maximum that flash translation layer (FTL) scans in the file directory table, and
It is determined according to the maximum critical point of maximum effectively cluster number.Therefore, the cluster when the data file in the file directory table
When number more forward than current markers cluster number, illustrate the time of the data file earlier than the current markers cluster number, i.e., it is described
Data file is legacy data, and therefore, the disabled module 30 forbids the modification to instruct corresponding modification operation.
The data storage device that the present embodiment proposes, when movable storage device detects the modification instruction of data file, first
It determines that the modification instructs corresponding data file, then determines cluster of the data file in preset file directory table
Number, if cluster number of the data file in the file directory table is more forward than current markers cluster number, forbid the modification
Instruct corresponding modification to operate, wherein the current markers cluster number when the movable storage device is powered on according to powering on before
The maximum critical point of maximum effectively cluster number determines, realizes after the movable storage device re-powers, the number before powering on
According to regard to persistence, it is not modified, rather than as traditional movable storage device can modify data at any time, to ensure that
The safety of data storage.Further, tradition is not modified in order to protect data, stores number using enciphered mobile storage apparatus
According to, since movable storage device uses some complicated encryption technologies, so that cost improves, and in the present embodiment, without using
Enciphered mobile storage apparatus storing data can also reduce the cost of data storage.
Further, in order to improve the flexibility that data store, data storage dress of the present invention is proposed based on first embodiment
The second embodiment set, in the present embodiment, referring to Fig. 5, the data storage device further include:
Second processing module 40 when for detecting the write instruction of data file, is write in preset file allocation table
Enter the data file, and record in the file directory table data file identification information and the data file
The cluster number of occupancy；
In the present embodiment, when the Second processing module 40 detects the write instruction of data file, first in the text
The data content of the data file is written in part allocation table, that is, FAT table, then in said write file directory table, that is, FDT table
The identification information of the data file, such as filename is written, and records the occupied cluster of the data file in the FDT table
Number, the information such as the write time of the data file are finally updated in the FDT table.
Memory module 50, if storing the data file for detecting cut-offing instruction.
Further, the data storage device includes update module, for by the cluster number of the data file more
New is maximum effective cluster number.
It is understood that when movable storage device is written in data file, even if the cluster number for the data file being newly written
Than the data file being written before cluster number rearward, but since the movable storage device does not power off, at this point, the number being newly written
Can also be modified according to file, therefore, in the file directory table maximum effectively cluster number be still last time power-off before most
Big effective cluster number, and be written at this after new data file, and when movable storage device power-off, the update mould
The cluster number of the data file of this new write-in is just updated to the effective cluster number of maximum of the file directory table by block.
It is of course also possible to which detecting cut-offing instruction, the memory module 50 directly stores the data file.And under
It is secondary when re-powering, the maximum recorded in the file directory table is just scanned by the flash translation layer (FTL) by the scan module
Effective cluster number.
In the present embodiment, after data file write-in, if if the movable storage device is not sent out and powered off at this time,
The operation such as can modify to the data file file of write-in, delete, add, at this time the current mark in the FDT table
Remember cluster number, is still generates according to powering on maximum cluster number in foregoing description FDT table, it will not be literary due to this new write-in data
Part and change.And when the movable storage device detects cut-offing instruction, it is powered at this point, the memory module 50 stores this
The data file being written later, and the cluster number of the data file of this write-in is updated to maximum effectively cluster number, value
It is noted that if this has multiple data files to be written the movable storage device, the update module by this most
The cluster number of the data file of the latter write-in is updated to maximum effective cluster number.
Further, the memory module 50, be also used to be written in preset file allocation table the data file it
Afterwards, the file allocation table is made a backup store.
In the present embodiment, the data file is written after the file allocation table in order to prevent, for some reason
Loss of data occurs, therefore, the memory module 50 is written in preset file allocation table after the data file, by institute
It states file allocation table to make a backup store, when losing in order to data file, the data file of backup storage can be used.
In the present embodiment, after powering on, the data file in movable storage device can be read, but cannot be repaired
Change or deletes, and after the power-up, data file can newly be written in movable storage device, in the case where not power down, newly write
The data file entered can be modified and be deleted, and after power down re-powers, the data being newly written before will be protected
Come, cannot be modified and be deleted, in the present embodiment, front and back is powered on by the movable storage device, old number can be distinguished
According to file and new data file, prevent the legacy data file of storage from being modified, to realize the protection to data file.
Further, in order to improve the flexibility that data store, data of the present invention are proposed based on first or second embodiments
The 3rd embodiment of storage device, in the present embodiment, referring to Fig. 6, the data storage device further include:
Modified module 60, for being leaned on when cluster number of the data file in the file directory table than current markers cluster number
When afterwards, modified according to modification instruction to the data file.
In the present embodiment, the cluster number when the data file in the file directory table is rearward than current markers cluster number
When, illustrate that the data file currently read is the data file being newly written after this is powered on, therefore, the modified module 60 can
To modify to the data file, after being equivalent to write-in new data file, want to modify data before power down (moving disk), or delete
Except data are all allowed, without that can not be modified once write-in data preservation, to improve the flexibility of data storage.
It should be noted that, in this document, the terms "include", "comprise" or its any other variant are intended to non-row
His property includes, so that the process, method, article or the device that include a series of elements not only include those elements, and
And further include the other elements being not explicitly listed, or further include for this process, method, article or device institute it is intrinsic
Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including being somebody's turn to do
There is also other identical elements in the process, method of element, article or device.
The serial number of the above embodiments of the invention is only for description, does not represent the advantages or disadvantages of the embodiments.
Through the above description of the embodiments, those skilled in the art can be understood that above-described embodiment side
Method can be realized by means of software and necessary general hardware platform, naturally it is also possible to by hardware, but in many cases
The former is more preferably embodiment.Based on this understanding, technical solution of the present invention substantially in other words does the prior art
The part contributed out can be embodied in the form of software products, which is stored in a storage medium
In (such as ROM/RAM, magnetic disk, CD), including some instructions are used so that a terminal device (can be mobile phone, computer, clothes
Business device, air conditioner or the network equipment etc.) execute method described in each embodiment of the present invention.
The above is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (10)
1. a kind of date storage method, which is characterized in that the date storage method includes:
When movable storage device detects the modification instruction of data file, determine that the modification instructs corresponding data file；
Determine that cluster number of the data file in preset file directory table, the dividing unit of cluster are 2nA byte, 2≤n≤9；
When cluster number of the data file in the file directory table is more forward than the position of current markers cluster number, forbid described
Modification instructs corresponding modification to operate, wherein the current markers cluster number is when the movable storage device is powered on according to powering on
The maximum critical point of preceding maximum effectively cluster number determines that the maximum effectively cluster number is the maximum data of cluster number in file directory table
The cluster number of file.
2. date storage method as described in claim 1, which is characterized in that the movable storage device detects data file
Modification instruction when, before the step of determining modification instruction corresponding data file, the date storage method further include:
When the movable storage device powers on, the effective cluster of maximum recorded in the file directory table is scanned by flash translation layer (FTL)
Number；
Using the maximum critical point of the maximum effectively cluster number as current markers cluster number.
3. date storage method as claimed in claim 2, which is characterized in that described when the data file is in the file mesh
Record cluster number in table it is more forward than the position of current markers cluster number when, the step of forbidding the modification that corresponding modification is instructed to operate it
Afterwards, the date storage method further include:
When the movable storage device detects the write instruction of data file, the number is written in preset file allocation table
According to the data content of file, and record in the file directory table identification information and data text of the data file
The cluster number that part occupies；
If detecting cut-offing instruction, the data file is stored.
4. date storage method as claimed in claim 3, which is characterized in that the movable storage device is in preset file point
After the data content of the data file is written in table, the file allocation table is made a backup store.
5. date storage method according to any one of claims 1-4, which is characterized in that the determination data file exists
After the step of cluster number in preset file directory table, the date storage method further include:
When cluster number of the data file in the file directory table than current markers cluster number position rearward when, according to described
Modification instruction modifies to the data file.
6. a kind of data storage device, which is characterized in that the data storage device includes:
First determining module when for detecting that the modification of data file instructs, determines that the modification instructs corresponding data text
Part, the dividing unit of cluster are 2nA byte, 2≤n≤9；
Second determining module, for determining cluster number of the data file in preset file directory table；
Disabled module, for being leaned on when cluster number of the data file in the file directory table than the position of current markers cluster number
When preceding, the modification is forbidden to instruct corresponding modification operation, wherein the current markers cluster number is when movable storage device powers on
It is determined according to the maximum critical point of the effectively cluster number of the maximum before powering on, the maximum effectively cluster number is that cluster number is most in file directory table
The cluster number of big data file.
7. data storage device as claimed in claim 6, which is characterized in that the data storage device further include:
Scan module when powering on for the movable storage device, is scanned in the file directory table by flash translation layer (FTL) and is remembered
The effective cluster number of maximum of record；
First processing module, for using the maximum critical point of the maximum effectively cluster number as current markers cluster number.
8. data storage device as claimed in claim 7, which is characterized in that the data storage device further include:
Second processing module, when for detecting the write instruction of data file, in preset file allocation table described in write-in
The data content of data file, and record in the file directory table data file identification information and the data
The cluster number that file occupies；
Memory module, if storing the data file for detecting cut-offing instruction.
9. data storage device as claimed in claim 8, which is characterized in that the memory module is also used in preset text
It is written in part allocation table after the data content of the data file, the file allocation table is made a backup store.
10. data storage device as claim in any one of claims 6-9, which is characterized in that the data storage device also wraps
It includes:
Modified module, for being leaned on when cluster number of the data file in the file directory table than the position of current markers cluster number
When afterwards, modified according to modification instruction to the data file.
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