G30 2017 540i with a "Hi-Fi sound system. It is my understanding that MP3 players which is in my car have a compression ratio of 11:1 allowing many CDs to be downloaded onto my car's 20Gb hard drive. However, only 69 CDs were able to be downloaded of the attempted 100 Cds. When I attempted to download one of the CDs not recorded, because it did not appear on the albums, artist and genre lists, the player said that it was already recorded! Many more than 69 CDs, although a few are old CDs and their album covers do not appear on the screen in the album list, should be able to be downloaded. Can someone assist in the matter? Your help with this would be appreciated.