Warning - Missing Audio Data Block Files (S)

Project check of “class audio file 71212_data” folder detected 4313 missing audio data (au) blockfiles (s), probably due to a bug, system crash, or accidental deletion. There is no wasn’t for Audacity t recover these missing files automatically.

If you choose the first or second option below, you can try to find and restore the missing files to their provious location. Note that for the second option, the waveform may not show silence.

How can I get my 9 hours of audio back??? This is terrible!!!

If you were recording at more than 48000 Hz then this will be more than 2^31 samples and you can only export the audio, not save it as a project:
http://wiki.audacityteam.org/wiki/Release_Notes_2.0.1#Large_Projects .

The audio is still in the _data folder, but there is no easy way to piece it together.


I exported as a wav file but it did not help. It says all 9+ hours are there. When I play the wav file, there is no sound. I did go to the file folder and all the .au files are there. How do I get that back onto a project. I click on the .au file but it does not play, gives me:

when importing uncompressed audio files you can either copy them into the project, or read them directly from their current location without copying .

do i copy and paste each .au file to a new project to listen to the file? Please help. Thanks

As the link says Missing features - Audacity Support , you can only export as WAV files (maximum 2 GB file size so as to ensure programs can play them) before closing the project (while Audacity is still reading the audio data correctly).

When you drag an .au file into Audacity and see that warning, you can choose either option then put a check in “Don’t warn again…” to prevent the warning appearing. It would take many hours or days to piece together the project that way, because each .au file would import into its own track. There is an “Append Import” Nyquist plug-in (see Append Import ) that might make the task less onerous, but If you recorded in stereo, the problem is that there will be two files with the same time stamp in Explorer (one file for each channel) and so it will not be possible to tell which file is for which channel without referring to the .aup project file.

A faster method than either of the above may be to piece together about 1000 to 1500 .au files by:

1 making a folder containing 1000 or 1500 files
2 sort the .au files by time
3 rename the files to a consistent alphanumerical sequence
4 use the 1.2 crash recovery utility to piece them together into a “recovery.wav” file.

However you still have the same issue that some files may be in the wrong channel.

I don’t think anyone has ever bothered to try and copy and paste the .au files to new folders in Explorer then make new .aup files for the new projects. This method would avoid any channel allocation problems. The new projects must not exceed 2^31 samples, so you will need more than one project. The number of projects you need depends on the project rate you recorded at, as explained at Missing features - Audacity Support .

If you want to try and make new folders and new project files, please attach the .aup file for the project (Upload attachment underneath the message Preview/Submit buttons where you reply). If the .aup is larger than 1 MB, please post it to one of:


and give us the address of the file. We could try making one new project from the first hour or two of audio, and see what happens. If it worked you would have to make the remaining projects yourself in the same way.