The enormous success of the CD-ROM has led to development of the CD-Recordable format and has resulted in a dramatic change in its market position. The CD-R media were introduced in the market place several years ago. The first media had stability problems. Since then, a series of improvements were developed, although incomplete, have resulted in the use of a wide variety of applications, in particular, CD-ROM editing. These applications favour higher data transfer speeds than that used for testing as defined in the Red Book. Recording higher than double the speed as defined in the Red Book creates both technological and compatibility problems. For that reason the CD-R standard, as described in the Orange Book, initially deals with single (lx) and double (2x)recording speeds.