DVD-R(W) format uses a slow wobble (140,6kHz) for tracking and speed, and the addressing (and additional) information is carried by the land pre-pits (pre-recorded pits between grooves). On the groove signal, pre-pits give amplitude spikes.




DVD+R(W) format uses a much faster wobble (817,4kHz), and the addressing (and additional) information is carried by a phase modulation of this wobble called ADIP (ADdress In Pre-groove).



the phase modulation method has a better noise immunity than the pre-pits method, and therefore ADIPs are generally more robust than LPPs against all external disturbances (electrical noise, disc tilting, focusing problems, etc).

實驗證明DVD+RW使用的相位調變紀錄抗雜訊能力比DVD-RW強多了,也就是說
DVD+RW燒錄的資料正確性極佳,因此在速度上DVD+RW可以表現其優點,馬上
12倍的+R燒錄機就要出現,而-R陣營仍提交不出8倍的標準spec.


Another major advantage of DVD+RW format over DVD-RW (although no drive support it yet) is hardware defect management provided by the DVD+MRW standard (Mt Rainier for DVD+RW). On a DVD+MRW disc, when an error occur during a read or write access to an ECC block, this block is flagged as bad and the drive will not use it any more. Instead, when writing to the disc, data which should have been stored in this bad block are relocated elsewhere ; likewise, when the drive is asked to read these data again, it will fetch them from the new location. These operations are completely transparent for any software (whatever operating system, driver or burning application is used)




DVD+RW對資料正確性保護非常好,如果某ECC區塊讀寫時有錯誤產生,機器會把
該區塊標上記號,不在使用,而壞區塊中的資料將搬移到別處,不論您的作業系統,燒錄
軟體,驅動程式為何.

所以DVD+RW沒那麼慘啦,他對資料的安全性及正確性都是當今規格內屬1屬2,至於
重複抹寫和續接的部分也是DVD+RW佔優勢,以上資料部分轉載於www.CDFreaks.com,該網站不偏
任何一陣營,有興趣可參考一下.