CD-ROM normally expressed with binary prefixes, subtracting the space used for error correction data. A standard 120 mm, "700 MB" CD-ROM can actually hold about 737 MB (703 MiB) of data with error correction (or 847 MB total). In comparison, a single-layer DVD-ROM can hold 4.7 GB of error-protected data, more than 6 CD-ROMs. CD-ROM discs are read using CD-ROM drives. A CD-ROM drive may be connected to the computer via an IDE (ATA), SCSI, SATA, FireWire, or USB interface or a proprietary interface, such as the Panasonic CD interface, LMSI/Philips, Sony and Mitsumi standards. Virtually all modern CD-ROM drives can
Philips CD-i best software required the MPEG upgrade card. By mid-1996 the U.S. market for CD-i software had dried up and Philips had given up on releasing titles there, but continued to publish CD-i games in Europe, where the console still held some popularity. With the home market exhausted, Philips tried with some success to position the technology as a solution for kiosk applications and industrial multimedia. In addition to consumer models, professional and development players were sold by Philips Interactive Media Systems and their VARs. Philips marketed several CD-i player models. There also exist a number of hard-to-categorize models, such as