CRC Errors In RAR Files
First of all, you need to bypass the CRC check when extracting the files. My solution is to completely ignore all the errors.
What you must do is go to WinRAR in the Start Menu. In winrar you click File --> Open and then select the files you want to unrar. Then you click the “Extract To” icon and check the box that says “Keep Broken Files” under miscellaneous. Any CRC error windows that show up during the extraction you can just ignore and close them. The resulting extracted file worked just fine.
The problem with winrar is when you open a broken rar file, it gives you a warning that the rar is broken and rar creates the folder with no file in it. This is the default setting of winrar but you can change it to open broken, corrupted or partially downloaded file (specially media files which you can plan on VLC media player)
This is what you have to do -
1. On the rar file, right click and click on Extract Files …
2. It will show you a window where you can select the folder where the file should be saved. Now select the checkbox where it says Open Broken Files (see the below image)
and click on OK. Now as usual if its a partial file or broken file, winrar will again give you warning, just cancel it. Once the operation gets over, you should see the partial file or files which winrar was able to extract. This tricks works really well on movie files which are broken into parts, you can download the first part of the movie, extract it to see the quality of it and to decide whether you should download the full movie or not. It also works well for multiple files rar achieve as winrar may be able to extract many files.
Unfortunately if there is a single standalone file which is in corrupted rar file, you will be able to get much from it. You can try to repair the rar file but I have never seen it working. Also note that if you have a middle part of the rar, say 2nd or 3rd part of a three part rar archive you won’t be able to get anything as the meta information of every rar file is in the first part.
Edit - You can also try to use 7 Zip software. I have used it many times and it does recover broken zip and rar files. I will make a separate post on 7 zip but felt its worth mentioning it here.
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