CN102508855A - Method and device for quickly clearing data in storage medium - Google Patents
Method and device for quickly clearing data in storage medium Download PDFInfo
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- CN102508855A CN102508855A CN201110298718XA CN201110298718A CN102508855A CN 102508855 A CN102508855 A CN 102508855A CN 201110298718X A CN201110298718X A CN 201110298718XA CN 201110298718 A CN201110298718 A CN 201110298718A CN 102508855 A CN102508855 A CN 102508855A
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Abstract
The invention provides a method and a device for quickly clearing data in a storage medium. The method comprises the following steps of: judging whether the storage medium is a master boot partition or a boot record partition; determining the partition type; determining a file system index table and the root directory position, and determining the corresponding directory or file in the root directory according to the attribute in the file system index table; in the case of corresponding file, searching for and deleting the file and the corresponding information of the file in the file system index table; otherwise, continuously searching for the final directory in a recursive mode; if the directory does not include any other file, clearing the directory structure and the corresponding information of the directory in the file system index table, and returning to the parent directory; and deleting the file and directory in a recursive mode until the root directory. The invention also provides a system using the method. Through the method and device provided by the invention, data analysis and clearing can be performed based on a file system, the storage medium is not subjected to reading/writing operation, and the data clearing time is shortened.
Description
Technical field
The present invention relates to field of data storage, the method and the device of data in particularly a kind of quick removing storage medium.
Background technology
The mode of data dump all is that whole storage medium is carried out write operation repeatedly in the existing storage medium, thereby reaches the destruction data integrity, to reach the purpose of data dump.But along with the capacity of existing storage medium is increasing, and the not bigger lifting of the read or write speed of storage medium, therefore the method with complete mode obliterated data can consume great amount of time.
The method of data has two kinds in the existing removing storage medium; A kind of is complete erase mode; The shortcoming of this method is to be directly proportional with the capacity and the read or write speed of storage medium the data dump time; Irrelevant with data content size actual in the storage medium, the data room of therefore no matter storing in the storage medium what, its checkout time is all very long; Another kind is based on the mode of file content pulverizing and removes the data in the storage medium; This method can be removed the file content of appointment fast; But in the existing file system, the attribute information of file separates with the content of file, and attribute information can comprise filename, file size, document creation and modification time etc.; And this mode can not be removed the attribute information of file, causes the partial information of file to be revealed.
Summary of the invention
Defective to the prior art existence; The invention provides the method and the device of data in a kind of quick removing storage medium; Not through write operation repeatedly to storage medium; And carry out data dump through the data structure of file system, reduce the data dump time and realized the complete removing of file data.
The method of data in a kind of quick removing storage medium comprises:
A. judge it is the main boot partition or the leader record subregion of storage medium file system based on 512 bytes of head of storage medium; If main boot partition; Then search the leader record subregion, if leader record subregion, then execution in step b based on main boot partition;
B. first 512 bytes of 512 bytes of head and known file system with the leader record subregion compare, and confirm divisional type;
C. confirm file system concordance list and root directory position according to 512 bytes of head of leader record subregion;
D. based on root attribute in the file system concordance list; Whether judge has data message in the root, if having, and execution in step e then; Otherwise remove data and the operation note of file system concordance list file system in root structure, the root respective file system index table, end erase;
E. according to the attribute of root directory in the file system concordance list, judge that root directory is catalogue or file down, if be catalogue, execution in step f then, otherwise, search and remove the data in file and the file respective file system index table, end erase;
F. whether according to the attribute of catalogue in the file system concordance list, judging has data message in the catalogue, if having, and execution in step h then, otherwise remove the data in bibliographic structure and the respective file system index table, and execution in step g;
G. return the upper level catalogue, and judge whether to be root directory, if execution in step d then, otherwise execution in step f;
H. according to the attribute of catalogue in the file system concordance list, judge that under the catalogue be catalogue or file,, then return step f if be catalogue, otherwise, search and remove the data in file and the file respective file system index table, and return step f.
In the described method; Step b compares first 512 bytes of 512 bytes of head and known file system of leader record subregion; Confirm divisional type; Comprise: system type flag in first 512 bytes of 512 bytes of head and known file system of leader record subregion is compared,, then confirm divisional type if identical; For example the 0x52 position begins meeting mark character string " FAT32 " in 512 bytes of head of FAT32 file system; The 0x52 position begins meeting mark character string " FAT " in 512 bytes of the head of FAT16 file system; The 0x03 position begins meeting mark character string " NTFS " in 512 bytes of the head of new technology file system.
In the described method, the known file system comprises FAT32 file system, FAT16 file system or new technology file system at least.
In the described method; Among the described step e; After searching and remove the data in file and the file respective file system index table, also comprise: remove data and file system concordance list file system operation record in root directory structure, the root directory respective file system index table.
The device of data in a kind of quick removing storage medium comprises:
First judging unit is used for judging it is the main boot partition or the leader record subregion of storage medium file system according to 512 bytes of head of storage medium, if main boot partition is then searched the leader record subregion according to main boot partition;
The divisional type confirmation unit is used for first 512 bytes of 512 bytes of head and known file system of leader record subregion are compared, and confirms divisional type;
Search the unit, be used for confirming file system concordance list and root directory position according to 512 bytes of head of leader record subregion;
Second judging unit is used for according to searching the file system concordance list root directory attribute that the unit finds, and whether in root directory have data message, if having, then get into the 3rd judging unit if judging, otherwise gets into the data dump unit;
The data dump unit is used for removing the data and the file system concordance list file system operation record of root directory structure, root directory respective file system index table, or searches and remove the data in file and the file respective file system index table, end erase;
The 3rd judging unit is used for when second judging unit confirms that root has data message, based on the attribute of root in the file system concordance list; Judge that root down for catalogue or file, if be catalogue, then gets into the 4th judging unit; Otherwise, get into the data dump unit;
The 4th judging unit; Be used for when the 3rd judging unit is confirmed to be catalogue under the root; Attribute according to catalogue in the file system concordance list; Judge whether data message is arranged in the catalogue; If have, then get into the 5th judging unit, otherwise; Remove the data in bibliographic structure and the respective file system index table, and get into the root judging unit;
The root directory judging unit is used to return the upper level catalogue, and judges whether to be root directory, if then get into second judging unit, otherwise gets into the 3rd judging unit;
The 5th judging unit is used for when the 4th judging unit confirms that catalogue has data message, according to the attribute of catalogue in the file system concordance list; Judge that under the catalogue be catalogue or file; If be catalogue, then get into the 3rd judging unit, otherwise; Search and remove the data in file and the file respective file system index table, and get into the 3rd judging unit.
In the described device; The divisional type confirmation unit compares first 512 bytes of 512 bytes of head and known file system of leader record subregion; Confirm divisional type; Comprise: system type flag in first 512 bytes of 512 bytes of head and known file system of leader record subregion is compared,, then confirm divisional type if identical.
In the described device, the known file system comprises FAT32 file system, FAT16 file system or new technology file system at least.
The invention provides the method and the device of data in a kind of quick removing storage medium, wherein method comprises: judge that storage medium is main boot partition or leader record subregion; Confirm divisional type; Confirm file system concordance list and root directory position; And according to the attribute in the file system concordance list; Confirm corresponding catalogue or file in the root directory, if respective file, then search and deleted file and file respective file system index table in information; Otherwise, continue to find last catalogue through recursive mode; When not having alternative document under the catalogue, remove the information in bibliographic structure and the catalogue respective file system index table, and return the upper level catalogue; Use recursive mode deleted file and catalogue, up to root directory.The present invention also provides a kind of system that uses this method; Through method provided by the invention and device; Can carry out data analysis and removing based on file system; Through to the write operation repeatedly of storage medium, and carry out data dump, reduced the data dump time and realized the complete removing of file data through the data structure of file system.
Description of drawings
In order to be illustrated more clearly in the present invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiment that put down in writing among the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is a method flow diagram of removing data in the storage medium fast;
Fig. 2 is an apparatus structure synoptic diagram of removing data in the storage medium fast.
Embodiment
In order to make those skilled in the art person understand the technical scheme in the embodiment of the invention better, and make above-mentioned purpose of the present invention, feature and advantage can be more obviously understandable, below in conjunction with accompanying drawing technical scheme among the present invention done further detailed explanation.
Defective to the prior art existence; The invention provides the method and the device of data in a kind of quick removing storage medium; Not through write operation repeatedly to storage medium; And carry out data dump through the data structure of file system, reduce the data dump time and realized the complete removing of file data.
The method of data is as shown in Figure 1 in a kind of quick removing storage medium, comprising:
S101: 512 bytes of head based on storage medium judge it is the main boot partition or the leader record subregion of storage medium file system; If main boot partition; Then search the leader record subregion, if the leader record subregion is then carried out S102 based on main boot partition;
S102: first 512 bytes of 512 bytes of head and known file system of leader record subregion are compared, confirm divisional type;
S103: 512 bytes of head according to the leader record subregion are confirmed file system concordance list and root directory position;
S104: according to root directory attribute in the file system concordance list, whether in root directory have data message, if having, then carry out S106 if judging, otherwise, carry out S105;
S105: remove data and file system concordance list file system operation record in root directory structure, the root directory respective file system index table, end erase;
S106: according to the attribute of root directory in the file system concordance list, judge that root directory is catalogue or file down,, then carry out S108 if be catalogue, otherwise, execution S107;
S107: search and remove the data in file and the file respective file system index table, end erase;
S108: according to the attribute of catalogue in the file system concordance list, whether in catalogue have data message, if having, then carry out S111 if judging, otherwise, carry out S109;
S109: remove the data in bibliographic structure and the respective file system index table, and carry out S110;
S110: return the upper level catalogue, and judge whether to be root directory,, otherwise carry out S108 if then carry out S104;
S111: according to the attribute of catalogue in the file system concordance list, judge that under the catalogue be catalogue or file,, then return S108 if be catalogue, otherwise, search and remove the data in file and the file respective file system index table, and return S108.
In the described method; S102 compares first 512 bytes of 512 bytes of head and known file system of leader record subregion; Confirm divisional type; Comprise: system type flag in first 512 bytes of 512 bytes of head and known file system of leader record subregion is compared,, then confirm divisional type if identical; For example the 0x52 position begins meeting mark character string " FAT32 " in 512 bytes of head of FAT32 file system; The 0x52 position begins meeting mark character string " FAT " in 512 bytes of the head of FAT16 file system; The 0x03 position begins meeting mark character string " NTFS " in 512 bytes of the head of new technology file system.
In the described method, the known file system comprises FAT32 file system, FAT16 file system or new technology file system at least.
In the described method; Among the S106; After searching and remove the data in file and the file respective file system index table, also comprise: remove data and file system concordance list file system operation record in root directory structure, the root directory respective file system index table.
The device of data is as shown in Figure 2 in a kind of quick removing storage medium, comprising:
Divisional type confirmation unit 202 is used for first 512 bytes of 512 bytes of head and known file system of leader record subregion are compared, and confirms divisional type;
The 3rd judging unit 206 is used for when second judging unit confirms that root has data message, based on the attribute of root in the file system concordance list; Judge that root down for catalogue or file, if be catalogue, then gets into the 4th judging unit; Otherwise, get into the data dump unit;
The 4th judging unit 207; Be used for when the 3rd judging unit is confirmed to be catalogue under the root; Attribute according to catalogue in the file system concordance list; Judge whether data message is arranged in the catalogue; If have, then get into the 5th judging unit, otherwise; Remove the data in bibliographic structure and the respective file system index table, and get into the root judging unit;
Root directory judging unit 208 is used to return the upper level catalogue, and judges whether to be root directory, if then get into second judging unit, otherwise gets into the 3rd judging unit;
The 5th judging unit 209 is used for when the 4th judging unit confirms that catalogue has data message, according to the attribute of catalogue in the file system concordance list; Judge that under the catalogue be catalogue or file; If be catalogue, then get into the 3rd judging unit, otherwise; Search and remove the data in file and the file respective file system index table, and get into the 3rd judging unit.
In the described device; Divisional type confirmation unit 202 compares first 512 bytes of 512 bytes of head and known file system of leader record subregion; Confirm divisional type; Comprise: system type flag in first 512 bytes of 512 bytes of head and known file system of leader record subregion is compared,, then confirm divisional type if identical.
In the described device, the known file system comprises FAT32 file system, FAT16 file system or new technology file system at least.
Method for a better understanding of the present invention, once the concrete application scenarios to this method specifies.
At first be set forth in and use this method to realize removing fast the method for data in the storage medium in the new technology file system.
In new technology file system, the file system concordance list is the MFT table.
S301: 512 bytes of head based on storage medium judge it is the main boot partition or the leader record subregion of storage medium file system; If main boot partition; Then search the leader record subregion, if the leader record subregion is then carried out S302 based on main boot partition;
S302: 512 bytes of head and the known file system type of storage medium are compared, but recognize divisional type;
The 0x03 position can mark character string " NTFS " in the new technology file system, and when the 0x03 position of confirming storage medium begins same mark " NTFS ", then the file system type of storage medium is the NTFS type;
S303: confirm MFT table position and root directory position according to the leader record subregion; Wherein the 5th in the MFT table is the position of root directory, and comprises content and attribute in the root directory in this item;
S304: based on the corresponding MFT Xiang of root $INDEX_ROOT attribute in the MFT table; Whether in root have data message, if having, then carry out S305 if judging; Otherwise remove De $LogFile file in root structure, the corresponding MFT item of root and the NTFS system, end erase;
S305:, confirm respective file or catalogue in the root based on the attribute of the corresponding MFT item of root in the MFT table;
0x16 is to the data of 0x17 position in each MFT item in the MFT table, if data are 0x01, what then represent the root directory correspondence is file, if data are 0x03, what then represent the root directory correspondence is catalogue;
If be file, the MFT item that then Qing Chu $DATA attribute indication data, and file are corresponding;
If be catalogue, then carry out S306;
S306: the MFT item Zhong $INDEX_ALLOCATION attribute in the corresponding MFT table of analytical bibliography, whether in catalogue have data message, if having, then carry out S308 if judging, otherwise remove bibliographic structure, the corresponding MFT item of catalogue, and carry out S307;
S307: return the upper level catalogue, judge whether to be root directory;
S308:, confirm respective file or catalogue in the catalogue according to the attribute of the corresponding MFT item of catalogue;
If respective file, the MFT item that then Qing Chu $DATA attribute indication data, and file are corresponding returns S306; Otherwise directly return S306.
Another embodiment of the present invention is in the FAT32 file system, to use this method to realize removing fast the method for data in the storage medium.
In new technology file system, the file system concordance list is the FAT table.
S401: 512 bytes of head based on storage medium judge it is the main boot partition or the leader record subregion of storage medium file system; If main boot partition; Then search the leader record subregion, if the leader record subregion is then carried out S402 based on main boot partition;
S402: 512 bytes of head and the known file system type of storage medium are compared, but recognize divisional type;
In the FAT32 file system 0x52 position can mark character string " FAT32, when the 0x52 position of confirming storage medium begins same mark " FAT32 ", then the file system type of storage medium is the FAT32 type;
S403: confirm FAT table position and root directory position according to the leader record subregion;
Multiply each other through the data of two bytes of 0x0B-0x0C and the data of two bytes of 0x0E-0x0F in preceding 512 bytes, can calculate the FAT table position, can calculate the position of root directory through the data of 0x2C-0x2F;
S404: according to the corresponding attribute of root directory in the FAT table, whether in root directory have data message, if having, then carry out S405 if judging, otherwise remove information and FAT table in root directory structure, the corresponding FAT table of root directory, end erase;
S405:, confirm respective file or catalogue in the root based on the corresponding attribute of root in the FAT table;
The type that the 0x0B byte can specified data in the FAT table, when this place value and 0x01 carry out with computing be 0, represent respective file, otherwise, represent corresponding catalogue;
If be file, then remove file content, and the data in the corresponding FAT table of file;
If be catalogue, then carry out S406;
S406: the attribute in the corresponding FAT table of analytical bibliography, whether in catalogue have data message, if having, then carry out S408 if judging, otherwise remove information in bibliographic structure, the corresponding FAT table of catalogue, and carry out S407;
S407: return the upper level catalogue, judge whether to be root directory;
S408:, confirm respective file or catalogue in the catalogue based on the attribute in the corresponding FAT table of catalogue;
If respective file is then removed file content, and the data in the FAT table of file correspondence, S406 returned; Otherwise directly return S406.
The invention provides the method and the device of data in a kind of quick removing storage medium, wherein method comprises: judge that storage medium is main boot partition or leader record subregion; Confirm divisional type; Confirm file system concordance list and root directory position; And according to the attribute in the file system concordance list; Confirm corresponding catalogue or file in the root directory, if respective file, then search and deleted file and file respective file system index table in information; Otherwise, continue to find last catalogue through recursive mode; When not having alternative document under the catalogue, remove the information in bibliographic structure and the catalogue respective file system index table, and return the upper level catalogue; Use recursive mode deleted file and catalogue, up to root directory.The present invention also provides a kind of system that uses this method; Through method provided by the invention and device; Can carry out data analysis and removing based on file system; Through to the write operation repeatedly of storage medium, and carry out data dump, reduced the data dump time and realized the complete removing of file data through the data structure of file system.
Though described the present invention through embodiment, those of ordinary skills know, the present invention has many distortion and variation and do not break away from spirit of the present invention, hope that appended claim comprises these distortion and variation and do not break away from spirit of the present invention.
Claims (7)
1. a method of removing data in the storage medium fast is characterized in that, comprising:
A. judge it is the main boot partition or the leader record subregion of storage medium file system based on 512 bytes of head of storage medium; If main boot partition; Then search the leader record subregion, if leader record subregion, then execution in step b based on main boot partition;
B. first 512 bytes of 512 bytes of head and known file system with the leader record subregion compare, and confirm divisional type;
C. confirm file system concordance list and root directory position according to 512 bytes of head of leader record subregion;
D. based on root attribute in the file system concordance list; Whether judge has data message in the root, if having, and execution in step e then; Otherwise remove data and the operation note of file system concordance list file system in root structure, the root respective file system index table, end erase;
E. according to the attribute of root directory in the file system concordance list, judge that root directory is catalogue or file down, if be catalogue, execution in step f then, otherwise, search and remove the data in file and the file respective file system index table, end erase;
F. whether according to the attribute of catalogue in the file system concordance list, judging has data message in the catalogue, if having, and execution in step h then, otherwise remove the data in bibliographic structure and the respective file system index table, and execution in step g;
G. return the upper level catalogue, and judge whether to be root directory, if execution in step d then, otherwise execution in step f;
H. according to the attribute of catalogue in the file system concordance list, judge that under the catalogue be catalogue or file,, then return step f if be catalogue, otherwise, search and remove the data in file and the file respective file system index table, and return step f.
2. the method for claim 1; It is characterized in that; Step b compares first 512 bytes of 512 bytes of head and known file system of leader record subregion, confirms divisional type, comprising: system type flag in first 512 bytes of 512 bytes of head and known file system of leader record subregion is compared; If identical, then confirm divisional type.
3. according to claim 1 or claim 2 method is characterized in that the known file system comprises FAT32 file system, FAT16 file system or new technology file system at least.
4. the method for claim 1; It is characterized in that; Among the described step e; After searching and remove the data in file and the file respective file system index table, also comprise: remove data and file system concordance list file system operation record in root directory structure, the root directory respective file system index table.
5. a device of removing data in the storage medium fast is characterized in that, comprising:
First judging unit is used for judging it is the main boot partition or the leader record subregion of storage medium file system according to 512 bytes of head of storage medium, if main boot partition is then searched the leader record subregion according to main boot partition;
The divisional type confirmation unit is used for first 512 bytes of 512 bytes of head and known file system of leader record subregion are compared, and confirms divisional type;
Search the unit, be used for confirming file system concordance list and root directory position according to 512 bytes of head of leader record subregion;
Second judging unit is used for according to searching the file system concordance list root directory attribute that the unit finds, and whether in root directory have data message, if having, then get into the 3rd judging unit if judging, otherwise gets into the data dump unit;
The data dump unit is used for removing the data and the file system concordance list file system operation record of root directory structure, root directory respective file system index table, or searches and remove the data in file and the file respective file system index table, end erase;
The 3rd judging unit is used for when second judging unit confirms that root has data message, based on the attribute of root in the file system concordance list; Judge that root down for catalogue or file, if be catalogue, then gets into the 4th judging unit; Otherwise, get into the data dump unit;
The 4th judging unit; Be used for when the 3rd judging unit is confirmed to be catalogue under the root; Attribute according to catalogue in the file system concordance list; Judge whether data message is arranged in the catalogue; If have, then get into the 5th judging unit, otherwise; Remove the data in bibliographic structure and the respective file system index table, and get into the root judging unit;
The root directory judging unit is used to return the upper level catalogue, and judges whether to be root directory, if then get into second judging unit, otherwise gets into the 3rd judging unit;
The 5th judging unit is used for when the 4th judging unit confirms that catalogue has data message, according to the attribute of catalogue in the file system concordance list; Judge that under the catalogue be catalogue or file; If be catalogue, then get into the 3rd judging unit, otherwise; Search and remove the data in file and the file respective file system index table, and get into the 3rd judging unit.
6. device as claimed in claim 5; It is characterized in that; The divisional type confirmation unit compares first 512 bytes of 512 bytes of head and known file system of leader record subregion, confirms divisional type, comprising: system type flag in first 512 bytes of 512 bytes of head and known file system of leader record subregion is compared; If identical, then confirm divisional type.
7. like claim 5 or 6 described devices, it is characterized in that the known file system comprises FAT32 file system, FAT16 file system or new technology file system at least.
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| CN111581163A (en) * | 2020-05-12 | 2020-08-25 | 山东省计算中心（国家超级计算济南中心） | Data traceless deletion method and system based on NTFS (New technology File System) |
| CN111581163B (en) * | 2020-05-12 | 2022-03-08 | 山东省计算中心（国家超级计算济南中心） | Data traceless deletion method and system based on NTFS (New technology File System) |
| CN112486924A (en) * | 2020-12-17 | 2021-03-12 | 深圳软牛科技有限公司 | Method and device for searching file deletion time in NTFS (New technology File System) and electronic equipment |
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