CD-R

Recordable compact disc (CD-R).

A CD-R (Compact Disc Recordable). They can be recorded in several sessions, however the added information cannot be deleted or overwritten, instead the free space left by the immediately previous session must be used.

Currently recorders can record CD-R at 52x, about 7800 KB/s.
For many computers it is difficult to maintain this recording rate and for this reason the recorders have systems that allow recording to be resumed in the event of a cut in the arrival of data.

The total capacity of a CD-R is usually:

• 650 MiB = 681.57 million bytes
• 700 MiB = 734 million bytes. The most common.
• 870 MiB = 838 million bytes.
• 900 MiB = 943 million bytes.

These capacities are valid for data discs. The VCD, SVCD or CD-Audio formats use another format, the CD-XA that uses parts of the CD that are used for error correction in data CDs. Thus, 13.5% more capacity is obtained in exchange for greater sensitivity to scratches and other aggressions.

The speed at which information is transferred from a disk to a computer is called the data transfer rate, and is measured in kilobytes per second (kB/s).^{[citation required]}

History

Recordable compact discs.

The first CD-R specification, originally called CD Write-Once (WO), dates from 1988 and was made by Philips and Sony in the Orange Book. The Orange Book consists of several parts, detailing the CD-WO, the CD-MO (Magneto-Optic), and the CD-RW (ReWritable). The latest editions stopped using the term "CD-WO" in favor of "CD-R" and "CD-MO" lost use. CD-Rs and CD-RWs are technically fully compliant with CD audio (Red Book) and CD-ROM (Yellow Book) standards, although some Red Book CD-compliant devices may have difficulty read CD-Rs and CD-RWs^{[citation needed]}. These use EFM, CIRC error correction plus one defined for CD-ROM.

Dye materials developed by Taiyo Yuden made CD-R discs compatible with CD audio and CD-ROM discs.

Related

• Bootleg