Verbatim DVD+R Dual LayerWelll the drive writes the DL media without problem. I copyied "The Grudge" minus a couple of languages (forgot to reset all the options). Anyway the file was 7,212,281,856 Bytes in length. This equated to 3,521,622 Sectors with 1,764,922 Sectors on layer one and the remainder on layer two.
Burn time was 37 minutes and 12 seconds. Of this time about one minute is need to finalize the disc. The write speed was a very stable 2.5x, as reported by DVD DeCrypter, excpet for the few seconds that the layer change was taking place (50% completed).
I tried playing the burned disk on my el-cheapo ($25) jWIN DVD player and it did not like the media. Lots of skips,stuters, and jump aheads (etc). I then tried it in my newer Sony player and all was well. It also reads well in the NEC 6500A and Pioneer DV-108.
Media type is: MKM-001-00.
So, there you have it - it does write and read dual layer DVD media (At least Verbatim works).