CN101699429A - Method for deleting file - Google Patents
Method for deleting file Download PDFInfo
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- CN101699429A CN101699429A CN200810104345A CN200810104345A CN101699429A CN 101699429 A CN101699429 A CN 101699429A CN 200810104345 A CN200810104345 A CN 200810104345A CN 200810104345 A CN200810104345 A CN 200810104345A CN 101699429 A CN101699429 A CN 101699429A
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Abstract
The invention discloses a method for safely deleting a file, which comprises the following steps: firstly, executing a request operation according to a file request sent by an operating system; secondly, judging whether the type of the file request is a file deleting request or not; if the type of the file request is a file deleting request, comparing the file system graphic formula structures after the deleting operation and before the deleting operation to acquire the file corresponding to the deleting operation; and finally, eliminating the contents in the block data according to the deleted file.
Description
Technical field
The present invention relates to a kind of method of file delete, relate in particular to the method for classified papers in a kind of safety deletion computing machine.
Background technology
Usually some have in the environment of confidentiality in government offices, enterprise etc., have comprised a large amount of classified papers or sensitive data in the computing machine, and are therefore very important for the management of these files and data.Yet move on computers or when deleting these data, operating system can not be clear clean with data usually, just left out itself the position of preserving data, this just will reveal to confidential data and stay opportunity.At present some recover softwares and can utilize above-mentioned leak to obtain these data, and then cause tremendous loss for corresponding enterprise or unit even country.
Summary of the invention
For solving above-mentioned middle problem and the defective that exists, the invention provides a kind of method of file delete.
The present invention is achieved by the following technical solutions:
The method of a kind of file delete involved in the present invention comprises:
Set up the graphic of a file system according to the data block at file place; Carry out a solicit operation and upgrade the graphic of described file system according to the file request that operating system is sent; Judge whether described file request type is the request of file delete; When described request is file deletion requests, contrast the graphic structure of upgrading after preceding graphic structure of described file system of the corresponding deletion action of described file deletion requests and the deletion action of described file system, to obtain described deletion action corresponding file; Remove the fast information of data at its place according to described deleted file.
The graphic structure of wherein said file system comprises the graphic reference position of described file, length and data message, described length is represented the quantity in the data block at file place, and the data in the described data block are represented state in the data block of file place with binary bit sequence.Described documents system schema structure also comprises following steps: read described updating file system schema structure; Contrast the binary bit sequence of described updating file system's schema structure and the graphic structure of the preoperative described file system of file delete by turn; Find out the data block at described deleted file place according to described comparing result.
The beneficial effect of technical scheme provided by the invention is:
The file delete operation of high level of security in the not only suitable several file system of various operating systems of the present invention, and, therefore can not cause leakage because of confidential data not needing to delete relevant data safely, up hill and dale under the artificial prerequisite that participates in of user.
Description of drawings
Fig. 1 is the flow chart of steps of file safety deletion method.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, embodiment of the present invention is described further in detail below in conjunction with accompanying drawing:
Referring to Fig. 1, present embodiment provides a kind of method of file safety deletion, and this method comprises: at first file system drives to file system and sends out file request 201, and for example, the deletion action of a certain file is carried out in request.Drive the solicit operation 202 of carrying out correspondence according to above-mentioned request call file system, the return request 203 then, then the operation requests type is judged, and whether be deletion action 204 to confirm, if not deletion action then finishes; Otherwise, obtain the information 205 in graphic after graphic structure of file system before the file delete operation and the deletion action.
Here need set up the graphic structure of a file system according to position, quantity and the user mode of the data block in the file system, and then set up the fast diagrammatic representation of data at file place with patterning.The graphic structure of file system comprises graphic reference position, length and data block, wherein graphic reference position integer representation; Graphic length also is integer, is used for the quantity of the data block of the graphic record of log file system; Data in the data block are represented with binary sequence, each indicates the state of a data block in this binary sequence, for example 0 expression data block is unoccupied, 1 expression data block is occupied, and the length of data content determines by graphic length, therefore, can be according to the deleted file of deletion action correspondence, change the data content of its place data block, i.e. corresponding binary digit in the sequence of figures is with according to deletion action updating file system schema structure.
Then, compare 206 according to new, the old schema structure before and after the deletion action, and find out the data block 207 at deleted file place according to comparative structure.Then, remove the content 208 in the data block of searching, last return result is to operating system 209.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.
Claims (3)
1. the method for a file safety deletion is characterized in that, described method comprises:
Set up the graphic of a file system according to the data block at file place;
Carry out a solicit operation and upgrade the graphic of described file system according to the file request that operating system is sent;
Judge whether described file request type is the request of file delete;
When described request is file deletion requests, contrast the graphic structure of upgrading after preceding graphic structure of described file system of the corresponding deletion action of described file deletion requests and the deletion action of described file system, to obtain described deletion action corresponding file;
Remove the fast information of data at its place according to described deleted file.
2. the method for file delete according to claim 1, it is characterized in that, the graphic structure of wherein said file system comprises the graphic reference position of described file, length and data message, described length is represented the quantity in the data block at file place, and the data in the described data block are represented state in the data block of file place with binary bit sequence.
3. the method for file delete according to claim 1 is characterized in that, described documents system schema structure also comprises following steps:
Read described updating file system schema structure;
Contrast the binary bit sequence of described updating file system's schema structure and the graphic structure of the preoperative described file system of file delete by turn;
Find out the data block at described deleted file place according to described comparing result.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810104345A CN101699429A (en) | 2008-04-17 | 2008-04-17 | Method for deleting file |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810104345A CN101699429A (en) | 2008-04-17 | 2008-04-17 | Method for deleting file |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101699429A true CN101699429A (en) | 2010-04-28 |
Family
ID=42147888
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810104345A Pending CN101699429A (en) | 2008-04-17 | 2008-04-17 | Method for deleting file |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101699429A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103186482A (en) * | 2011-12-28 | 2013-07-03 | 联想(北京)有限公司 | Method and device for deleting data in hard disc |
-
2008
- 2008-04-17 CN CN200810104345A patent/CN101699429A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103186482A (en) * | 2011-12-28 | 2013-07-03 | 联想(北京)有限公司 | Method and device for deleting data in hard disc |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20100428 |