If you find a file displaying the corrupt icon, you can hover your mouse mover the corrupt icon for information on what type of corruption was found. The information will be displayed in the Status Bar at the very bottom of the library. 

Corrupt file: This MP3 is completely invalid and is not playable.
Self-explanatory. Possible causes are disk bad sectors, file system corruption, wrong file types, wrong file extensions, etc

Corrupt file: This file contains invalid audio data.
Serato DJ encountered invalid data while looking for audio in this file. This message alerts you to the fact that the file you’re trying to play contains corrupt data. This may, or may not, affect playback.

Corrupt file: This MP3 contains no valid frames.
No audio could be found in this file, which means it is completely unplayable as far as Serato DJ is concerned. Please make sure this really is an audio file

Unsupported file: This file is more than 2 GB in size.
At the moment, Serato DJ does not support files that are 2 GB in size (or larger).

Unsupported file: This file has data blocks greater than 2 GB in size.
This file contains chunks of data that are larger than 2 GB. Serato DJ does not support files that are more than 2 GB in size.

Corrupt file: This WAV contains no valid chunks.
This WAV file contains no recognizable WAV data. It is quite possible that this might not be a WAV file.