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可重复录写光盘（Compact Disc ReWritable；CD-RW）的记录层是一种相变合金，跟CD-R中的染色聚合体不同。在一片新的CD-RW中，相变合金以一种高反光性晶体形式存在，当红光高功率激光光束对相变合金加热，被加热的部分便会变得黯淡无光，这就相当于一般光盘上的微坑。如果再次用红光高功率的激光加热相变合金，它又会变回晶体，这样就可以再次写入数据，这无形中提升了存储备份的使用价值，但由于材料的特性关系，所以其改变次数有所限制，大约在一千次左右，以后期对激光光的反射率只有15%，远低于CD-R的65%，在此情况下只有使用MultiRead功能的光驱才能正常读取。

CD-RW (Compact Disc-ReWritable) is a digital optical disc storage format. A CD-RW disc is a compact disc that can be written, read arbitrarily many times, erased, and written again. The technology was introduced in 1997.

CD-RW discs (CD-RWs) require readers that have more sensitive laser optics than are required to read plain CDs. Consequently, CD-RWs cannot be read in many CD readers built prior to the introduction of CD-RW. CD-ROM drives that bear a "MultiRead" certification claim compatibility.