CDA

CD Audio Track.

This is the type of file burnt onto a standard audio CD that can be extracted to your hard drive by using a CD ripper into WAV (Windows) or AIFF (Macintosh) files. The .cda files do not contain the actual music data, but instead tell where on the disc the track starts and stops. If the file is copied from the CD-ROM to the computer, it becomes useless, since it is only a shortcut to part of the disc.