This article is for recordings made using a Qu-16, Qu-24, Qu-32, Qu-Pac or Qu-SB. To attempt recovery of files recorded with a Qu-5, Qu-5D, Qu-6, Qu-6D, Qu-7, Qu-7D please see the following article: https://support.allen-heath.com/hc/en-gb/articles/41213015556369-Qu-Recovery-of-corrupted-SD-USB-A-recordings 

The following procedure should only be attempted on a Windows based PC.

Qu-Drive recordings can appear corrupt if the USB media is removed too early or the system loses power.
In this situation you can typically find yourself with eighteen .WAV files that report a length of 512/1K.
With Qu firmware 1.7+ you can recover the audio using the Windows based procedures below:

If the files appear to be the correct size already, please move to the Audacity audio import stage.

From the Windows Explorer (Highlight USB Media) > Right click > Select 'Properties' > Tools > Error-checking > Check now

In the dialogue box that follows select the following:

Automatically fix file system errors: YES, Scan for and attempt recovery of bad sectors: NO.

After running error-check, the files should appear to be the correct size, but still appear corrupt and will not load as .wav files (as they are still missing headers).

Audacity audio import

Using Audacity (http://audacity.sourceforge.net/) choose File > Import > RAW Data using the parameters below. Import all tracks you want to recover in one Audacity session. Ie, import track 1. Import track 2. Import track 3 etc.

Encoding: Signed 24 bit PCM
Byte order: Little-endian
Channels: 1 Channel (Mono)*
[*note that for stereo recordings this should be changed to ‘2 Channels (Stereo)’]
Start offset: 44 bytes
Amount to import: 100 %
Sample rate: 48000 Hz

Then click ‘Import’.

The files should now load correctly, after loading they must be saved as independent WAV files.

Go to File > Export Multiple. Choose “Other uncompressed files” as the Export Format, then click “Options”, and choose Header: WAV (Microsoft), and Encoding “Signed 24 bit PCM” > Export.