Oh no, never ever ID3-tag FLAC files. Use Vorbis comment which won't mess with some hardware players and will allow retagging. E.g. Tag&Rename will read the vorbis not ID3, but Foobar2000 will allow the ID3 to override + in perfect rips. ID3-tag might even mess with a perfect burn i.e. not a source=copy. Source being the actual physical CD first ripped.