Originally Posted by Kato

1. You can get 650MB, 700MB, 800MB and 900MB CD's. Depending on the reader, the 800/900MB discs may not be read properly.

2. As mentioned MP3's are a compressed format already. Changing the bitrate from 320kb/s to 192kb/s will take up less space, but at a reduced quality. Think of the difference between a CD and radio. Going lower than 192kb/s in my opinion is a waste of time as you start to lose more noticeable sound quality.