參考一下CD Freaks的技術性的文章...
http://www.cdfreaks.com/article/113

在使用上，DVD+/-R並沒有太大差異，有人會說DVD+R適合備分data；DVD-R適合備份Video
這是錯誤的
DVD的資料已經沒有像CD-R一樣有Mode1、Mode2的差別
DVD-Video反而是因為流量的大小不同而造成檔案大小的改變

硬要說的話，根據上面轉錄的CD Freaks的技術文章
裡面有提到
Another bad side effect of this pre-pits method is that DVD-R(W) mastering is made more difficult than with DVD+R(W), since a higher precision is required to cut both the grooves and the pre-pits between them. Special dual-beam recorders are usually required for - stamper mastering, although some manufacturers now also use single beam cutting.

Not only are the pre-pits more error prone than phase modulation, but data they carry are also less protected. In one ECC block pre-pits carry 192 bits of information (one pre-pit block). Out of these 192 bits, 48 are not protected by any error correction mechanism, 24 bits are protected by 24 bits of parity (A parity), and the last 56 bits are also protected by 24 bits of parity (B parity). All in all, this strange heterogeneous structure finally gives a pretty weak protection to the information bits carried by pre-pits.

轉貼的第二段裡面提到DVD-R1個ECC Block裡面有48bits是完全沒有在ECC的保護之下的
此外在有24bits只有parity保護(A parity)，最後還有56bits只有parity保護(B parity)
意思就是DVD-R的一個ECC Block裡面有48bits完全沒有ECC保護，有80bits(24+556)則是用Partity的保護措施
剩下的才有完全ECC保護.....

所以DVD-R比較適合用在稍微有錯誤不會導致大問題的資料上，例如DVD-Video、DVD-Audio
這樣在播放時不至於因為有錯誤而導致不能能播放

而DVD+R沒有這個問題...備份哪種資料都是可以的

==
LiteOn是比較擅長燒DVD+R....