根據 "廠商在網頁上提供的資料"，RAM 的保存年限還比 R 遜。
不重複貼文了，請參考之前的討論串：
http://forum.pcdvd.com.tw/showthrea...#post1077574401
染料怕變質 (R)，但相變材料也會怕改變結晶的狀態，請參考下文：
4. How Long Can You Store CDs and DVDs and Use Them Again?
http://www.clir.org/pubs/reports/pub121/sec4.html
(節錄部分文章)
4.3 CD-RW, DVD-RW, DVD+RW, DVD-RAM Discs
RW and RAM discs are generally not considered for long-term or archival use, and life expectancy tests are seldom done for this medium. Rewritable discs use a phase-changing metal alloy film for recording data and aluminum for the reflective layer. The alloy film is not as stable as the dye used in R discs because the m...