WinRAR method for solving CRC errors

WinRAR can be said to be now the most scenic compression software, the limelight gradually overshadowed the old winzip! Ultra high compression ratio, simple and easy-to-use interface, powerful function ... However, I do not know if you have encountered such a situation: hard to download the hundreds of trillion of RAR compressed files from the Internet, is decompression when suddenly pop-up a let you gripped dialog box! To tell you that something went wrong ...
Determine the cause of the error
The error message is "CRC failed on encrypted file (password error?) ) "(RAR compression package set password, but password input error or password input correct but cyclic redundancy check code (CRC) Error!" Only because of this RAR compression package added password, so wrar guess that may be "password error")
The method that distinguishes the above two kinds of errors: If the password is entered incorrectly, it cannot extract any files! However, if there are more than one file in the compressed package, and some of the files are uncompressed, then the RAR compression packet cyclic redundancy check code (CRC) error instead of the password input error.
Cyclic redundancy check code (CRC) error, this is the most common case, this is the focus of this article! Unlike some of the above decompression errors, this situation is related to the RAR compression pack damage.
There are several reasons:
(1) The network transmission situation is not good (such as too much disconnection, open the thread too much, the server too many people can not connect too much, etc.) caused the downloaded file damage!
(2) The site provides a RAR compression package is inherently damaged (this is no way, unless the package contains a recovery record).
(3) The use of the download tool is not perfect, such as some of the download tool opened a few more threads, download the end of the work is very slow, and sometimes downloaded to 99% when the data will no longer transfer, must be manual operation to end (first stop downloading and then start). I have met several times in this situation. The result is a CRC error when the file is downloaded and then decompressed to the end.
Emergency Solutions
1. Use of recovery records
To fix the CRC is conditional, there must be a recovery record in this RAR compressed package, and this recovery record is optional when the RAR compressed package is compressed.
and winrar compression is the default is not to place recovery records, if the provision is such a RAR compression package, then the user himself want to repair CRC error is impossible.
2. The most drastic
If the file in the RAR compressed package is the kind of even if the file is missing can still normal or more normal use (in fact, most of the files are not very sensitive to some data damage), then we can use our ultimate kill Recruit: The Method!
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 a good idea to add a recovery record to the already compressed RAR compressed package.
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!