I was talking about length of musical content - not file size. MP3 compression is around 11:1. Most music CDs - based on a quick sample of my collection - seem to clock in around the 45 - 50 minute mark. Call it 500 MB. So, a 500MB album is compressed to a 45MB MP3. 32000 / 45 is ~700 CDs worth of music. That is, if you were to take the top 700 albums of all time and turn them into MP3s, they would fit onto a 32GB microSD card. Sorry for the confusion.