I have a nasty habit of "shift and delete" which bypasses the recycyle bin. It was 100gb anyway which wouldnt have went in there.
I was defragging my old drive, which I think copies things about, which probably used quite a few of the used sectors.
There might be some room for undeleting some files though, I will investigate that. Thanks for the pointer.
I still think though, there are some files to be recovered from my new disk.
I should be looking at both options though, thanks.
I am going to run a recovery program on my new disk tonight, to see any possibility of recovering WAV files in the short term.
Will post any progress if anyone is interested.