Compressed-audio bit rate, ratio of original-to-compressed audio, and disk-space requirements.
| ENCODEDAUDIO BIT RATE | COMPRESSION RATIO | MODE | DISK SPACE PER MINUTE OF AUDIO |
| 16 Kbps | 48:1 | Mono | 120 KB |
| 24 Kbps | 32:1 | Mono | 180 KB |
| 56 Kbps | 26:1 | Stereo | 420 KB |
| 128 Kbps | 12:1 | Stereo | 960 KB |