Serious audiophile’s have used programs like audacity to check their music for distinctive lossy artifacts. Amazing how many Flac files are actually cheap ass mp3’s that were converted. Tsk Tsk. What they’ve done is take a 7mb mp3 and turn it into a 22mb Flac with inferior sound. Wasting a lot of space.
I never took the time to learn how to check for lossy artifacts. Now I don’t have too. Audiochecker is free and does the work for you.
If you’re willing to use triple the disk space for Flac then it helps to know they aren’t converted mp3’s.