CD-R CD-R CD-R (Compact Disc-Recordable) is a digital optical disc storage format. A CD-R disc is a compact disc that can be written once and read arbitrarily many times. CD-R discs (CD-Rs) are readable by most plain CD readers, i.e., CD readers manufactured prior to the introduction of CD-R. This is an advantage over CD-RW, which can be re-written but cannot be played on many plain CD readers. Originally named CD Write-Once (WO), the CD-R specification was first published in 1988 by Philips and Sony in the 'Orange Book'. The Orange Book consists of several parts, furnishing details of the CD-WO,
Philips Records the Philips Recording Center in Baarn, Netherlands, and formed Polyhymnia International (a recording and mastering company) and Pentatone Records (which specializes in SACD releases). Many of the Philips classical recordings have been reissued on the Eloquence label. Universal also released a "Philips 50" series marking the 50th anniversary of Philips Records in the early 2000s; some of those CDs are still in print. Pentatone has released Philips Quadraphonic sound recordings from the early and mid-1970s in 4-channel SACD format, as their RQR Series. Philips' classical catalog was issued on CD under the headings "Digital Classics", "Legendary Classics" and "Silver Line