SFV / CRC Failed / hash check failed
Troubleshooting guide for failed CRC check.
Notice: Whenever turning off the hash-check is advised in this guide, that's rather a workaround than a solution.
Follow the instructions and try to solve the reason behind your CRC failure so that you can leave this setting enabled!
2nd notice: This guide assumes that you're downloading multipart .rar or .zip archives.
If you're downloading single files such as .mp4 videos, chances are very high that even if the file is damaged, it is playable just fine meaning you will not be able to easily identify it as a broken file.
Try to re-download the file 1-2 times before following the steps down below. Chances are that it will work then!
1. Hardware issues
Exclude hardware issues by checking your HDD/SSD and RAM.
Especially broken RAM can cause issues during CRC checking!
For RAM checking, we recommend using the free software Memtest86.
2. Multihoster related problems
If you are downloading via multihoster, chances are that the multihoster is sending a different file than JD expects.
In this case the file itself might not be broken but JDownloader will use the hash of the original source to compare agains the one from the downloaded file and thus fail.
You can turn off the hash check temporarily, reset failed files and re-download them. If you can extract them without any issues chances are, your issue was caused by the multihost.
In this case, you can contact our support- and the support of that multihost so we can implement it properly and avoid these error messages from happening to you.
3. Wrong hash given by source website or broken file
In very rare cases, hash check can fail because JD simply gets a wrong hash to use for checking.
To find this out, download the file manually using your browser, then create the hash of it and compare it against the hash that JDownloader displays.
If the hash matches, the file itself is broken.
If the hash does not match, the file is broken server side or the source website is prividing a wrong hash.
4. Firewall/AV Scanner
Make sure that your Firewall/AV scanner does not interfere with JDownloader - this may also cause CRC issues.
Check this by e.g. completely disabling your Firewall and downloading the affected files again afterwards.
