How to resolve RAR file decompression failure

Attachments are often a series of compressed files, the download is the default filename is a random number.

As a result, compressed file decompression failed after downloading

Workaround: Rename the file name with a certain order when downloading, such as file 1, file 2, file 3, etc.

How do I resolve a single file decompression failure?

A lot of information in the forum is compressed using RAR, upload to download, in the process of decompression may occur errors. The most common occurrence is "CRC" error, that is, at the end of the decompression error occurred. The main reasons are: 1. The source file has a compression error; 2. There was an error at the end of the download due to too many threads; 3. The download is not complete.

Solutions: First, repair.

1, first open WinRAR main window, from the address bar to the damaged compressed files in the directory, select the damaged compressed files.

2, with the mouse click on the WinRAR toolbar "Repair", and then in the Drop-down menu selected "Repair archiver", then WinRAR will pop up a dialog box, let you choose to repair the file storage path.

3, set a good click "OK" to determine, WinRAR will begin to repair the damaged compressed files, and will be the form of a dialog box to show the whole process of repair.

4, access to your set of repair files stored directory, you will find that the directory added to a _reconst.rar or _reconst.zip compressed file, it is winrar for you to fix the good files. Try to decompress it, if everything is OK, then congratulations, your damaged compressed file has been repaired!

It should be explained that the WinRAR built-in compressed file Repair feature is not valid for all corrupted compressed files, and that WinRAR will become powerless for those severely damaged compressed files, or only some files in the compressed package can be repaired.

I used the method is very simple: in the absence of decompression (prompted by error) to copy files to other directories, such as decompression completed, OK, the file is still good, this method should be targeted, or enumerating the network practices.

The method of the network:

Method One: WinRAR itself with compression package repair function. Click "Repair compressed File" under the menu "Tools", the shortcut key is "Alt+r". This method can repair some of the general errors of the compression package, but the success rate is not high. You can try to fix it several times in a row. This function of WinRAR is more applicable to the case where there are many files in the compressed package and the file capacity is relatively small.

Method Two: Open the compression package (not decompression, but with WinRAR open), select the file you want to extract, click the right mouse button, in the pop-up menu select "No need to confirm direct decompression", shortcut key is "Alt+w". Using this method, whether it is a good compression package or bad compression package, all unimpeded, success rate of 100%!

Method Three: The method of the drastic measures!

The principle is to let the RAR compression package damaged files extracted, regardless of winrar warning, can decompress how much how much. Unzip the software or use WinRAR, but to do a small setup.

In the right click to extract the file after the pop-up window, the "Keep corrupted files" check box selected, click OK to start decompression. Do not ignore the decompression error information, after decompression, you will find that the corrupted file was extracted. The chances of a corrupted file being extracted in this way are still very high.

Do a good job in insurance

1. Recovery record

The original RAR compression package in compression, if you choose to place the recovery record, so that users download even if CRC error also have their own repair opportunities!

2. Take the volume compression

The use of the method of volume compression can greatly reduce the loss caused by unrecoverable errors.

3. The old document also records the recovery

Some people may ask, the new compressed RAR compression package can be added to the recovery record, then the compressed RAR package has no way to add a recovery record? It is possible to add a recovery record to the compressed RAR compressed.

Just open the compression pack and choose Protect Profile from the command menu.

Small common sense:

In fact, RAR compression package error resolution is mainly to prevention! If there is no prevention, wait until the real problem, technology is also no way to solve the perfect! Like cyclic redundancy check code (CRC) error in this case, if the RAR compression package does not contain recovery records, the user himself want to repair CRC is impossible! The main purpose of this article is to tell you some of the reasons for the error and to discuss some fundamentally prevent mistakes and minimize the loss of the way!

Report:

1.CRC algorithm principle

CRC is the abbreviation of Cyclic redundancy code, translated into Chinese is "cyclic redundancy code", it uses the polynomial coding method, is an efficient error control method. The so-called CRC32 is also the 32-bit CRC algorithm, which is described in the previous SFV algorithm. CRC algorithm coding and decoding method is simple, error detection and error correction ability, so in communications, satellite, control and other fields have a wide range of applications in our computer, is also widely used in compression, disc burning, data storage and so on.

In fact, the CRC, we think more is the compression software, because many friends have encountered compression software prompts "CRC error", which is actually a file verification process, but this process is automated: Compression software in the compressed file automatically in the compression package to add CRC check information, The CRC is automatically validated when uncompressed, and the file is checked for completeness and correctness.

Actual Combat: CRC Error resolution

Phenomenon One: Recently winrar no matter what files are extracted, are prompted "CRC checksum failure, file is corrupted."

Solution: This may be a problem with winrar temporary file save, which typically only requires opening the system temp directory (under Windows 2000/xp for/documents and settings/username/local settings/temp), Delete a folder named "Rar$di00.*".

Phenomenon two: Just downloaded a software compression package, using WinRAR decompression when prompted a file "CRC checksum failure, file destroyed."

Solution: This situation can be judged that the compression package out of the problem, but in many cases the CRC error does not mean that the entire compression package has been broken, it is likely that only a part of the file is damaged. You can try to use "Fix compressed file" in "Command" menu, it can solve the problem of partial CRC error generally. If it still doesn't work out, you can try the forced decompression skills: first open the compression package, select all files except the CRC error file, first extract the normal files, and then extract the error file, when the CRC error message, do not click on any confirmation button, open the "explorer", Find the extracted file save path, you can see that the wrong file has actually been decompressed, copy it to other files to save the folder, and then try the program can be normal operation, in many cases, if this file is not executable program, the impact on the operation is not very large.

Simple and convenient WinRAR user identity verification

In addition to the CRC automatic check function, WinRAR also provides users with a special authentication function, which can help users understand whether their compressed package has been modified.

Combat: Make a "only allowed to change" compression package

Select the file you want to compress in Explorer, right-click, select Add to compressed file, open the Compress file name and Parameters window, check the Add user authentication information option in compression options, and click OK to generate a compressed package.

Double-click to open this package, you can see in the Address bar "User check information exists" Hint, click menu command → display information to open the dialog box, and in the User authentication information column, you can see the file name of the package, the creator, and the date created (see Figure 1), and note the information, especially the creator The information in.

Now you can provide this compression package to the receiver and provide user authentication information at the same time. When the other side opens the compression pack, you can open the "Display Information" dialog box, and the identity of the information you provide to compare, if the exact same words, the package has not been modified, if the identity of the information does not exist or changes, then the compression package has been modified.

Small Tips

This feature requires the use of the registered version of the WinRAR, because the authentication information is generated according to the registered user name, and a compressed package that is added with the identity check information is modified, the identity check information will be lost, which is its calibration principle.