| Standard | Nominal Capacity | True Capacity (bytes) | True Capacity (megabytes) | True Capacity (gigabytes) |
| CD-ROM | 650 MB | 681984000 | 650.3 | 0.6351 |
| 700 MB | 737280000 | 703.1 | 0.6866 | 90 minutes | 829440000 | 791.0 | 0.7725 |
| 99 minutes | 912384000 | 870.1 | 0.8497 | |
| DVD-5 | 4.7 GB | 4700372992 | 4483 | 4.377 |
| DVD-9 | 8.5 GB | 8547993600 | 8152 | 7.95 |
Sources: Wikipedia: CD-ROM, Wikipedia: DVD-ROM, SSS – File Storage & Management