KR20070111076A - The way how to delete hard disk data perfectly - Google Patents

Abstract

A method for deleting data of a hard disc completely is provided to reduce the time for deleting data by sensing an accurate position of an applicable cluster and deleting the cluster simultaneously and to improve operation speed by decreasing searching speed when deleting an individual file or a folder unit. A method for deleting data of a hard disc includes a step of deleting the data in an individual file folder unit which are not deleted logically(S1); a step of deleting all the data which are deleted logically, completely(S2); a step of deleting the all data which are stored in a storage medium completely(S3); and a step of removing the optional data which are generated in a marginal area, when the actual size of the file is different from a logical storage unit of the storage medium(S4).

Description

{The way how to delete hard disk data perfectly}

1 is a flowchart of a hard disk data permanent deletion method of the present invention.

FIG. 2 is a flowchart of step S1 of completely deleting in an individual file folder unit that has not been logically deleted in the method of permanently deleting hard disk data of the present invention.

3 is a flowchart of step S2 of completely erasing all logically deleted data of the hard disk data permanently deleting method of the present invention.

Fig. 4 is a flowchart of step S3 of completely deleting all data stored in a storage medium of the method of permanently deleting hard disk data of the present invention on a window.

Fig. 5 is a flowchart of step S4 of removing any data generated in the blank area when the actual size of the file and the logical storage unit of the storage medium of the present invention hard disk data permanently differ.

6 is a flowchart illustrating the detailed steps of the method for permanently erasing hard disk data of the present invention.

 << Explanation of symbols for main part of drawing >>

S1: Completely deleting in 'individual file folder units' which have not been logically deleted.

S2: completely erasing all logically deleted data of the hard disk data permanently deleting method of the present invention.

S3: completely deleting all data stored in the storage medium on the window.

S4: removing any data generated in the blank area when the actual size of the file and the logical storage unit of the storage medium are different.

The present invention relates to a method for permanently deleting a file stored in a computer storage device so that recovery is impossible. After defragmenting, the location of an individual file is determined to remove data existing in the storage area, If the logical storage unit of the storage media is compared and its size is different, the remaining area is filled with random data to completely delete the existing data, and to safely delete it from the storage media unit under the Windows operating system. It is about how to.

In line with the accelerated information age, personal information has been leaked from public institutions, credit bureaus, telecommunications workplaces, and employment sites. It is being exchanged online and the ways of exploiting it are getting more sophisticated.

In addition to these external hacking damages, the leakage of internal databases (hereinafter referred to as "DB") where the most important data actually comes and goes is increasing.

Problems that previously existed only on web servers or on the network have now been approached internally, and important data have been leaked and misused, bringing fatal damage beyond comparison.

In particular, due to the increasing severity of the damage caused by personal information leakage, especially financial institutions, telecommunications companies, public institutions, etc., it is urgent to prepare measures for personal information management and security.

Until now, many security solutions for networks and systems have been developed and distributed. However, the solutions related to DB security are still far from technical and market aspects.

For companies, it's important to keep these large numbers of transactions without incidents, so be cautious about introducing and applying new security systems.

The important point in DB security is to always encrypt and store the data itself and to separate and manage the access rights for each administrator so that even if the data is leaked, it cannot be abused. This is a fundamental solution.

In addition, in DB security, even if the supplement is strengthened, since the source can not be removed fundamentally, it may be said to remove the already stored data.

For example, if you release a hard disk that stores personal information and related DBs of bank customers, there is a risk that the related DBs will be misused, so these hard disks are usually released after removing the stored DB.

However, in general, the DB removal method provided by the operating system does not completely erase the data and can be easily recovered by a recovery program. Therefore, special management of the hard disk discarded by an institution or a bank is required.

For the above reason, a 'computer hard disk data erasing system and a hard disk cleaning storage medium' developed to be unable to recover by a recovery program are disclosed in Korean Laid-Open Patent No. 2003-0053067.

The conventional hard disk erasing system is a method of completely removing existing data stored in a storage area by applying a method of overwriting an arbitrary file or a letter with respect to a recoverable file by using a data recovery means. By filling the recoverable character string with other characters, it is possible to recover the existing contents of the data because it is restored to other data even if it is recovered.

However, the conventional method requires a lot of searching time when permanently deleting individual files or folders, because when the permanent deletion of individual files or folders is performed, all file folders stored in the storage medium are examined and the storage location of all file folders is calculated. There is a disadvantage.

In addition, in order to completely remove all logically deleted file data, all file folders stored in the storage medium must be examined and all logically deleted data must be selected and removed, which takes a long time to remove.

In the conventional system, after booting from a floppy disk or a compact disk used to remove all data stored in a storage medium, the storage medium is examined in a DOS state, the storage medium is calculated, and then ROM-BIOS is used. There is a hassle to store on your storage media.

The system overwrites the actual size of the file to remove the file data, and nowadays when the actual size of the file and the logical storage unit of the storage medium are different, that is, nowadays the logical size of the storage medium is different. Since data can be recovered using the difference between the storage unit size and the actual size of the file (Slack Data), a simple file overwriting method is difficult to completely delete data.

The present invention was devised to solve various problems of a system for permanently deleting data stored in a storage medium, and by applying a defragmentation means, it is possible to determine the location of a cluster used by file data. You can find out the exact location of the cluster and delete it at the same time, which greatly reduces the time it takes to delete the data. Also, you can find out the area that is generated due to the difference between the actual size of the file and the logical storage unit of the storage medium. It is an object of the present invention to provide a method of permanently erasing data stored on a storage medium such that the data stored on the storage medium cannot be recovered.

The object of the present invention is achieved by four steps consisting largely in a parallel configuration, each step of the step of completely deleting in the "individual file folder unit" not logically deleted, and all the logically deleted data Completely erasing, completely erasing all the data stored in the storage medium on the window, and removing any data in the blank area if the actual size of the file and the logical storage unit of the storage medium are different. It is composed.

That is, according to the data stored in the storage device, by selectively performing one or more of the above steps, data can be completely deleted so that it cannot be recovered.

Each of the stages configured in parallel is classified into sub-steps which are sequentially processed, and the individual sub-steps are re-executed and proceeded to the next sub-step or re-executed by moving to a higher sub-step depending on whether each step is judged. By sequentially or repeatedly performing the substeps of, the data stored in the storage device is completely deleted.

Looking at the detailed sub-steps of each step as described above are as follows.

First of all, the step of deleting from a non-logically deleted individual file folder unit is impossible to recover.

Selecting the individual file folder not logically deleted;

Inputting a delete command and searching for a file to calculate a size of the selected file data;

A small step of operating defragmentation application means for calculating the actual position of the file data;

A small step of overwriting the actual location of the file data requiring deletion with arbitrary data by the actual size of the file;

It is a small step that calculates the margin area that occurs when the actual size of the file and the logical storage unit of the storage medium are different and fills it with arbitrary data.

The term 'logically deleted' means that the actual data exists but the operating system recognizes that the operating system is deleted, and that other data may be stored in the area used by the logically deleted file data.

Secondly, deleting all logically deleted data so as to be impossible to recover includes: selecting a target storage medium to be deleted and inputting a delete command;

Obtaining a size of an unused area of the selected storage medium;

A small step of calculating an unused cluster position of the storage medium in the defragmentation application means;

It consists of a small step of overwriting arbitrary data by the size of the unused area.

Thirdly, deleting the data stored in the storage medium on the window such that the data cannot be recovered includes: selecting a target storage medium to be deleted and inputting a delete command;

Determining whether the selected storage medium is a bootable storage medium, and determining whether to delete by the physical storage medium unit or the logical storage medium unit;

Calculating a start position, a size, and the like of the selected storage medium;

It consists of a small step of overwriting with arbitrary data from the start position to the end position of the selected storage medium.

The physical storage media and the logical storage media are related to partitions, and partitioning means partitioning and using one physical storage medium as if it were several physical storage media.

For example, by dividing one physical storage drive, C drive, into C :, D :, E :, etc. to create multiple drives, the computer considers this to be a completely different hard disk, so unless you erase the partition, It is recognized as an independent space in general work such as moving data.

Contrary to the above, combining the C :, D: and E: drives into the C: drive is referred to as "partitioning".

After partitioning, the data must be saved in 'High Level Format'.

There are two main ways to partition, which can be divided at the operating system level and with utilities such as Partition Magic.

That is, the use of a single physical storage medium by dividing a partition as described above is referred to as 'logical storage medium partitioning' as a concept opposite to using a plurality of physical storage media.

Finally, removing all random data generated when the actual size of a file present on the storage medium and the logical storage unit of the storage medium are different includes selecting a storage medium to be deleted and inputting a delete command. Steps;

Retrieving the number of files present in the storage medium and sub-steps for retrieving all the files stored in the storage medium;

Calculating the actual size of the retrieved file;

A small step of operating a 'fragment collection means' for calculating an actual position of the retrieved file;

Calculating a final cluster position used by the file data when the actual size of the file and the logical storage unit of the storage medium are different;

It is a small step that calculates the difference between the logical storage unit of the storage medium and the actual size of the file and overwrites any data in that space.

Arbitrary data resulting from the difference between the actual size of the file and the logical storage unit of the storage medium is called 'file slack data'.

Today's recovery technology searches 'file slack data' occurring in all files on the storage media and is used as evidence for investigation when useful data is used, as well as personal information or bank data recovered by criminal organizations or hackers. Can cause great damage.

Normally, this 'file slack data' is a RAM SLACK when the file is stored when the actual size of the file differs from the logical storage unit of the storage medium, i.e. the operating system is any data that resides in any area of main memory (RAM). If Drive SLACK and Drive SLACK, which are data that have been logically deleted from the storage medium, are different from each other, fill in the corresponding data.

Therefore, in order to delete data safely, you must delete 'File Slack Data'. When you permanently delete 'File Slack Data', the file is overwritten by the difference between the actual size and the file allocation size. Must be used.

The matters relating to the operational effects including the technical configuration for the above object of the hard disk data permanently deleting method of the present invention will be clearly understood by the following detailed description with reference to the drawings showing the preferred embodiments of the present invention.

1 is a flowchart of a hard disk data permanently deleting method of the present invention, and FIGS. 2, 3, 4, and 5 are detailed step-by-step flowcharts of each step of the hard disk data permanently deleting method of the present invention.

As shown in FIG. 1, the method of permanently deleting hard disk data according to the present invention includes: completely deleting in individual file folder units that are not logically deleted (S1); Completely deleting all data logically deleted (S2); Completely deleting all data stored in the storage medium on the window (S3); When the actual size of the file and the logical storage unit of the storage medium are different, each step of the step S4 of removing any data generated in the blank area is configured in parallel, and optionally one or more of the steps By doing so, the data stored in the hard disk is completely deleted. The steps are as follows.

First, as shown in Figure 2, the step (S1) of deleting to be impossible to recover in units of individual file folders that are not logically deleted,

A small step (S101) of selecting a file or folder to be permanently deleted on a file / folder basis;

A small step (S102) requesting whether or not to be permanently deleted;

A small step (S103) of calculating an actual position using a command for calculating a cluster position when defragmenting a disk;

A small step (S104) of overwriting the storage medium with an arbitrary character by the actual size of the file or folder to be deleted;

A step S105 of comparing the actual size of the file or folder to be deleted with an allocation size (File Quota Size);

A small step (S106) of moving to the last cluster position used by the deletion target and subtracting the actual size from the allocation size of the file;

A small step (S107) of overwriting the Slack Data with arbitrary data;

A small step (S108) of changing a name of a file or folder to be deleted to an arbitrary name;

A small step (S109) of changing the size of the file to 0 bytes;

It consists of a sequential substep of the step S110 of deleting by a logical deletion command of the operating system.

In the small step (S102) of requesting whether to permanently delete the small step, and the small step (S105) of comparing the actual size and file size of the file or folder to be deleted (S105), some small items may be selected according to a selection. The step is not executed.

In the small step (S102) of requesting whether to permanently delete or not, it is determined whether to permanently delete the file or folder to be permanently deleted in the selected file folder unit. In step S110, if not, it is determined that the step (S1) of deleting to be impossible to recover in units of individual file folders that are not logically deleted.

In addition, in a small step (S105) of comparing the actual size of the file or folder to be deleted and the allocation size (File Quota Size), as a step of checking the presence or absence of the Slack Data, the Slack Data size is calculated and the actual start of the Slack Data. If the actual size and the allocation size are different, the following sub-steps (S106 to S110) are executed sequentially. If not, the two sub-steps of this sub-step among the sub-steps are calculated. Instead of executing the steps S106 to S107, the process is executed sequentially from the small step S108 of immediately changing the name of the file or folder to be deleted to an arbitrary name.

After the sequential sub-steps S101 to S110, it is determined whether it is completed, and another step S2, S3, S4 is performed or the step S1 is repeatedly performed to store data stored in the storage device. Delete it completely.

Secondly, as shown in FIG. 3, the step S2 of deleting all of the logically deleted data so as to be impossible to recover may include permanently deleting an area that is not logically used, that is, presently used or present in the storage medium. This is a step of completely initializing the rest of the file except a file or folder, and each sub-step is as follows.

The step S2 of deleting all the data logically deleted to be impossible to recover includes: a step S201 of selecting a storage medium to permanently delete an area not logically used;

A small step (S202) requesting whether or not to permanently delete;

A small step (S203) of calculating unused space and position of the selected storage medium;

A small step (S204) of generating a temporary file of 0 bytes;

A small step (S205) of checking whether unused space of the storage medium remains;

A small step (S206) of appending a temporary file with any data in an appropriate unit;

A small step (S207) of logically deleting the generated temporary file;

Changing the names of files in the storage medium area that are not logically used to arbitrary data (S208);

A small step (S209) of sequentially changing a file size of a storage medium area that is not logically used to 0 bytes is performed sequentially; and a small step (S202) of requesting whether to permanently delete the selected small step among the small steps; The small step (S205) of checking whether the unused space of the storage medium remains is performed by selectively or not executing the small step depending on whether the storage medium is present. Looking at each of the small steps as follows.

In the small step (S202) of requesting whether to permanently delete or not, it is determined whether to permanently delete the area that is not used logically, and when deleting, the next small steps (S203 to S209) are sequentially performed. Next, the step S2 of deleting all logically deleted data so as to be impossible to recover is terminated, and it is determined whether all the steps S1 to S4 are completed.

In step S203 of calculating the unused space and the location of the selected storage medium, a specific cluster location is calculated by calculating a free space of the storage medium using a command for calculating a logically unused area and not using the storage medium. Computing a specific location using a means for calculating the step, and if the unused space is left, after executing a small step (S206) of adding a temporary file in an appropriate unit of arbitrary data, and again selected storage medium The small steps (S203) of calculating the unused space and the position of are repeated. Otherwise, the next steps (S207 to S209) are executed sequentially.

After the sequential sub-steps (S201 to S209) as described above, it is determined whether it is completed, proceeds to another step (S1, S3, S4), or repeatedly performed the step (S2) data stored in the storage device Delete it completely.

Third, as shown in FIG. 4, the step S3 of deleting the data stored in the storage medium on the window such that the data is not recoverable may be completely initialized by completely permanently deleting the storage medium except for booting. The substeps are as follows.

Deleting the data stored in the storage medium on the window so as not to recover (S3) comprises: a small step (S301) of selecting a storage medium to be completely initialized;

A small step (S302) of checking whether the storage medium to be executed is a bootable storage medium;

A step S303 of calculating and displaying information on a logical storage medium and a physical storage medium on a screen;

A small step (S304) of calculating information of the physical storage medium;

A small step (S305) of calculating information of the logical storage medium;

A small step (S306) of checking the actual starting position of the storage medium to be executed;

A small step (S307) of overwriting arbitrary data on the storage medium to be executed with the size of the memory buffer;

A small step (S308) of moving to a position to be executed;

A small step (S309) of checking whether or not it is the last position of the storage medium.

In the step S302 of checking whether the storage medium to be executed is a bootable storage medium, after checking the selected storage medium to initialize, if the selected storage medium is a bootable storage medium, if the target is deleted, the computer does not boot itself. Therefore, the target is selected again without deleting.

In a small step (S303) of calculating and displaying information on a logical storage medium and a physical storage medium on a screen and selecting the same, it is determined whether the selected storage medium is a logical storage medium or a physical storage medium, and each physical storage is determined according to the determination. After calculating the information (start position, size) of the medium or calculating the information (start position, size) of the logical storage medium, the following steps S306 to S309 are sequentially performed.

Further, in the small step S309 of checking whether the storage medium is the last position, it is determined whether the position of the storage medium is the last, and if not, the upper steps S307 to S308 are repeatedly executed.

After the sequential sub-steps S301 to S309, it is determined whether it is completed and the data stored in the storage device by performing another step S1, S2, S4, or repeatedly performing the step S3. Delete it completely.

Finally, as shown in FIG. 5, the step (S4) of deleting all the 'file slack data' existing in the storage medium is a step of permanently deleting the entire Slack data. .

Deleting all 'file slack data' existing in the storage medium (S4), a small step (S401) for selecting a storage medium to permanently delete the entire Slack Data;

A small step (S402) of calculating the total number of files of the selected storage medium and confirming that the value is not zero;

A step S403 of performing a full search for calculating the size and location of the file of the selected storage medium;

A small step (S404) of checking whether the actual size of the file and the allocation size (File Quota Size) are different;

A small step (S405) of calculating an actual size and a starting position of the Slack Data;

Overwriting Slack Data with arbitrary data (S406);

In step S407, a check is made to see if there is a residual file.

In the small step (S402) of calculating the total number of files of the selected storage medium and confirming that the value is not zero, if the total number of files of the selected storage medium is zero, that is, if there are no files to delete, the next small step ( All steps S4 are immediately finished without the need to execute S403 to S407.

In addition, a small step (S404) of checking whether the file size is different from the actual file size is a step of checking whether or not the Slack data is present. In this step, the actual size of the file is larger than the allocated size. In this case, the lower three sub-steps (S405 to 407) are executed. If not, the execution ends after the non-execution.

Then, in a small step (S405) of calculating the actual size and the start position of the Slack Data, it moves to the last cluster position used by the deletion target and subtracts the actual size from the file allocation size.

In a small step (S407) of checking whether there is a residual file, the presence or absence of a residual file is checked, and if there are residual files, the upper four steps (S403 to S406) are repeatedly executed.

After the sequential sub-steps S401 to S407, it is determined whether it is completed and the data stored in the storage device by performing another step S1, S2, S3, or repeatedly performing the step S4. Delete it completely.

That is, as shown in Fig. 6, the method for permanently erasing hard disk data of the present invention selectively checks whether the target storage medium is completely deleted during the parallel steps S1 to S4 as described above. Perform.

As described above, the hard disk data permanently deleting method of the present invention has the advantage that the data can be safely deleted so that it can not be recovered by selectively repeating each step of the parallel configuration of all the data stored in the storage medium, When deleting individual files or folders, the search speed is significantly reduced, and the overall work speed is improved.

Claims (5)

In the method for deleting data stored in the storage medium, Completely deleting the data in units of individual file folders that are not logically deleted (S1); Completely deleting all data logically deleted (S2); Completely deleting all data stored in the storage medium on the window (S3); When the actual size of the file and the logical storage unit of the storage medium are different, step S4 of removing any data generated in the blank area is connected in parallel, and at least one of these steps is selectively repeated. A hard disk data permanently deleted method. The method of claim 1, wherein the step (S1) of completely deleting each file folder unit that is not logically deleted includes: A small step (S101) of selecting a file or folder to be permanently deleted on a file / folder basis; A small step (S102) requesting whether or not to be permanently deleted; A small step (S103) of calculating an actual position using a command for calculating a cluster position when defragmenting a disk; A small step (S104) of overwriting the storage medium with an arbitrary character by the actual size of the file or folder to be deleted; A step S105 of comparing the actual size of the file or folder to be deleted with an allocation size (File Quota Size); A small step (S106) of moving to the last cluster position used by the deletion target and subtracting the actual size from the allocation size of the file; A small step (S107) of overwriting the Slack Data with arbitrary data; A small step (S108) of changing a name of a file or folder to be deleted to an arbitrary name; A small step (S109) of changing the size of the file to 0 bytes; Hard disk data permanent deletion method comprising a small step (S110) to delete by a logical deletion command of the operating system. The method of claim 1, wherein the step (S2) of deleting all the logically deleted data to be impossible to recover, A small step (S201) of selecting a storage medium for permanently deleting an area not logically used; A small step (S202) requesting whether or not to permanently delete; A small step (S203) of calculating unused space and position of the selected storage medium; A small step (S204) of generating a temporary file of 0 bytes; A small step (S205) of checking whether unused space of the storage medium remains; A small step (S206) of appending a temporary file with any data in an appropriate unit; A small step (S207) of logically deleting the generated temporary file; Changing the names of files in the storage medium area that are not logically used to arbitrary data (S208); And a small step (S209) of changing the size of a file in a storage medium area that is not used logically to 0 bytes. The method of claim 1, wherein the deleting of the data stored in the storage medium on the window such that the data is not recoverable (S3), A small step (S301) of selecting a storage medium to be completely initialized; A small step (S302) of checking whether the storage medium to be executed is a bootable storage medium; A step S303 of calculating and displaying information on a logical storage medium and a physical storage medium on a screen; A small step (S304) of calculating information of the physical storage medium; A small step (S305) of calculating information of the logical storage medium; A small step (S306) of checking the actual starting position of the storage medium to be executed; A small step (S307) of overwriting arbitrary data on the storage medium to be executed with the size of the memory buffer; A small step (S308) of moving to a position to be executed; Hard data erasing method characterized in that it comprises a small step (S309) to determine whether the last position of the storage medium. The method of claim 1, wherein deleting all 'file slack data' present in the storage medium includes: A small step (S401) of selecting a storage medium to permanently delete the entire Slack Data; A small step (S402) of calculating the total number of files of the selected storage medium and confirming that the value is not zero; A step S403 of performing a full search for calculating the size and location of the file of the selected storage medium; A small step (S404) of checking whether the actual size of the file and the allocation size (File Quota Size) are different; A small step (S405) of calculating an actual size and a starting position of the Slack Data; Overwriting Slack Data with arbitrary data (S406); And a small step (S407) of checking whether there is a residual file.

Images