Filewipe-commercial-level file erasure tools are available for download

Introduction

Filewipe-commercial file erasure Tool
The default behavior meets the commercial Data erasure requirements.
A random value of N times (6 by default) is used to erase the specified file at all times.
Supports file wildcard and subdirectory traversal.
Log files can be recorded.
The number of random value filling times is optional. The default value is 6.
Directly fill the physical sector, skip System File buffering and disk scheduling, and ensure reliable erasure.
Random Number seed for filling is obtained through high-random sources such as hardware noise and cpu tsc (through Win32 Crypto API ). The SHA algorithm is used to generate random data, which conforms to the random degree of the password encoding level.
Fill in disk clusters. Different random data is used for each fill.

　

Commercial Data erasure

From the perspective of the file system, when the operating system deletes a file, only relevant records in the file table are cleared and the disk clusters occupied by the file are marked as available. The actual content of the file is still stored on the disk. This is correct in terms of efficiency and storage device life. However, this also makes it easy to delete files.

A better solution is: first fill in the original content of the file with junk data (for example, all zero or all one), and then delete it. At this time, even if you use the reverse deletion tool to restore, all you get is a file full of junk data.

However, due to the physical characteristics of the magnetic medium, the coverage of a single data can only greatly weaken the imprints of the original signal on the medium. After the coverage, there will still be some weak information, residual signal (magnetic residue) of raw data is retained. This is like the human ears can still hear traces of the original recording when playing a washed tape. Under professional data recovery equipment, raw data can be reborn with these residual signals.

Therefore, commercial Data erasure generally requires that the storage media be cleaned at least seven times in a zero-sum and full-one manner. As shown in the preceding example, a record of audio must be repeatedly erased (demagnetized) for seven times.

However, pure cleaning (degaussing) is not the best solution. Use dirty data for contamination, which is far better than cleaning. For a tape, the effect is far from putting it in a noisy downtown and repeat the recording for seven times. The new input sound is confused with the remaining ones, it is more difficult to identify than quiet coverage (simple Cleansing.

The data in the storage media is also roughly the same: the random data filled in each time is confused with the original magnetic residue, and the magnetic strength levels stored are highly random. This makes it difficult for analysts to find templates to regenerate raw data. The last full and zero fill is mainly used to further purify noise.

　

Military-Level Data erasure

I consulted a brother who worked in the relevant departments of the Army. Answer: "There is such a problem, we are all directly physically crushing ......". It seems that unless the Stamping Machine is programmed, it is impossible to use software to implement military-level erasure.

　

Help Screen

C: \ Documents ents and Settings \ Administrator>
# Filewipe

========================================================== ========================================================
File Wiper Version 2.1.0.702 by running Yang/2003-2006, Freeware
========================================================== ========================================================
Use N pass random data + 1 pass full zero + 1 pass full one to overwirte and
Delete specified files

USAGE: filewipe {FilePattern} [RandomPassNumber] []

========================================================== ========================================================
Options:
FilePattern-file and dir search pattern
RandomPassNumber-how many times to overwrite the specified files
-Random data, Default is 6
-S-include subdirectory (!! DANGER !!)
-Logfile:-using a logfile.
-Loglevel-specify the lowest logging level, can be:
DebugOnly (Most Detail)
Info (DEFAULT)
Warning
Error
FatalError
Disabled (Close Logging Output)
-Priority:-specify the process running priority, can be:
Idle
BelowNormal
Normal (DEFAULT)
AboveNormal

========================================================== ========================================================
Examples:
Filewipe *. doc
Filewipe MyDoc.txt 2
Filewipe * 15/logfile: "C: \ wipe. log"
Filewipe */s/priority: BelowNormal

　

Simple Chinese help

C: \ Documents ents and Settings \ Administrator>
# Filewipe

========================================================== ========================================================
File erasure tool, version: 2.1.0.702 by Yang/2003-2006, Free Software
========================================================== ========================================================
Use N random data + one full zero + one full overwriting and delete the specified file

Usage: filewipe {FilePattern} [RandomPassNumber] []

========================================================== ========================================================
Option:
FilePattern-file wildcard
RandomPassNumber-specifies the number of random data overwrites. The default value is 6.
-S-contains sub-directories (Dangerous !)
-Logfile:-specify a log file.
-Loglevel-specifies the log details, which can be:
DebugOnly (most detailed)
Info (default)
Warning
Error
FatalError
Disabled (disable log function)
-Priority:-specifies the running priority of a process, which can be:
Idle
BelowNormal
Normal (default)
AboveNormal

========================================================== ========================================================
Example:
Filewipe *. doc
Filewipe MyDoc.txt 2
Filewipe * 15/logfile: "C: \ wipe. log"
Filewipe */s/priority: BelowNormal

　

Notes

File erasure is IO-intensive and skips the file buffering and disk scheduling mechanisms of the operating system to ensure reliability. These are all at the cost of reducing the performance. In typical cases (for example, data cleansing before leaving the company), users often want to erase a large amount of data (there are not a few people with OutLook folders larger than 10 Gb ). Before you start, you should realize that this operation is time-consuming and may take several hours to complete.

If you want to continue using the computer during the operation, we recommend that you use the "-priority" option to set the running priority of filewipe to "Idle" or "BelowNormal ", in this way, it can run quietly in the background, and you can continue to use the computer during this period.
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