The .cda files are small "pointer" files. These direct the drive playing an Audio CD to the actual file where the music is .
The above is the best I can explain it simply . A commercial pressed CD doesn't actually have files.
A CD is read by focusing a 780 nm wavelength (near infrared) semiconductor laser through the bottom of the polycarbonate layer. The change in height between pits and lands results in a difference in the way the light is reflected. By measuring the intensity change with a photodiode, the data can be read from the disc.
In the future you need to used a ripping software like EAC or dBpowerAmp CD Ripper .
WMP is a crappy CD ripper so don't use it.
Then rip to a lossless format like .wav or .FLAC . The resulting files will be between 30MB & 100 MB & can vary some outside of that but usually don't. This would mean a 10 track CD with an average of 50MB for each track is 500MB .
It would be nice if songs could be compressed to 44 bytes & still sound good.
I don't think 44bytes would be a blip you could hear.
So better luck next time . We all have to learn.