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Method for completely deleting files on hard disk

A technology that completely deletes and deletes files. It is applied in the direction of instruments, electronic digital data processing, and storage systems. It can solve problems such as data deletion, hard-to-find directories, and temporary files that are not easily found by users.

Inactive Publication Date: 2002-07-17
KOAL SOFTWARE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Although it is said that after the file is deleted through the ordinary file deletion function, the data area of ​​the hard disk will be rewritten many times through continuous writing and writing of data in and out of the hard disk, covering the previous data, that is to say, through data recovery The software will not be able to completely restore the deleted data, but we consider from the hardware point of view, because the current hard disk is a magnetic medium, after the data is rewritten to a certain magnetic area, there is still residual magnetic field, even after multiple overwrites, before The data is not necessarily completely deleted, and it is still possible to obtain the data before overwriting through the remanence analysis tool
[0009] Because the operating system uses a lot of temporary files in order to improve efficiency or facilitate the operation of the operating system or the user’s convenience, these temporary files are generally not easy for users to find, or the system hides them, or stores them in a directory that is relatively difficult to find. These files are left on the hard disk, which is also likely to pose a security risk

Method used

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Examples

Experimental program
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Embodiment Construction

[0025] The present invention will be further described in detail below in conjunction with the examples.

[0026] A method for completely deleting hard disk files, the actual content of the file is completely modified by rewriting the actual content of the file multiple times, the method includes the following steps:

[0027] a. Before deleting the file, read the attribute and content of the file, if the attribute is a non-writable file, modify the attribute to be writable;

[0028] b. Call the random number generation function of the system to get a random number, and use the random number to rewrite the content of the file read in step a multiple times until the actual content of the file has been completely modified, wherein, the number of times of rewriting The default is 5 times, and it can also be set by the user according to the actual situation;

[0029] c. Use the deletion method that comes with the system to perform ordinary file deletion operations on the file.

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Abstract

The present invention provides a method for completely deleting hard disk file. It is characterized by rewriting physical contents of file many times or regualrly cleaning residual space of data storage zone of hard disk and zone in which the contents are not distributed so as to completely modify the physical contents of the file and ensure that the deleted file or catalog can not be restored.

Description

technical field [0001] The invention relates to the field of computer software, in particular to a method for completely deleting hard disk files. Background technique [0002] Generally, when a user deletes a file through the file deletion method provided by the common operating system, the operating system just marks the directory of the file for deletion or deletes the allocation of the file in the area of ​​the file allocation table, and the actual data of the file It has not been cleared, and it may be restored. Some undelete software can search the data on the disk to restore the actual file content. [0003] Disks use magnetic media to record data, and there is still remanence after data rewriting. Even after multiple overwrites, it is still possible to obtain the data before overwriting through remanence analysis tools. [0004] Temporary files of the operating system often save user data without the user's knowledge, such as tempora...

Claims

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Application Information

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IPC IPC(8): G06F12/0868
Inventor 宋寒松范峰
Owner KOAL SOFTWARE CO LTD
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