I am new to the forum but i am using netmd user for 3 years.have mz505 and have new himd 600 model.need help about file size? why? cd > 256k atrac3plus >11.21 mb cd > 256k mp3 >11.29 mb how come pretty much same file size from same track ripping from cd. so the sound quality od 256k atrac3plus and mp3 same? or sony hiding something about atrac3plus