Its released from Buffalo for their users, seems to support DVD-R DL, as you can read over here
I offer the program software which updates the firmware of DVM-DM16FBS (PX[ by the PUREKU star ]-716A drive) to Ver.1c04 (the beta version). Although it is checking that the writing by 2X is realizable by disk ATTOWANSU to DVD-R (two layers) of the trial product which is in our company, since it is beta version and cannot guarantee not only including the writing to these media but including other operation, please understand beforehand the firmware exhibited lately. In order to avoid un-arranging on use, and the fault when performing update of a firmware, please carry out this program for you to often read the following explanation.
The write-in check to DVD-R (two layers) turns into a check at the time of using trial production software, and is product appending software. At the time of using it cannot be guaranteed [ of operation ]. About DVD-R (two layers) write-in correspondence with product appending software, it will be correspondence in mid-January, Heisei 17. It is planning. <> Formal version correspondence schedule time : the middle of January, Heisei 17 Since the schedule of standard decision is behind to assumption of our company, formal correspondence time is made to postpone. It will obtain. I apologize.
Firmware version 1c04 (the beta version) The contents of update 2x write-in correspondence to <1.02->1c04> and DVD-R (two layers) media.
[Attention] Please perform update of a firmware on a visitor's own responsibility. Failure of firmware update does as onerous correspondence about a repair request by the cause.
As it seems when using the beta firmware:
* VariRec (only DVD should use -- it does not become precocious) are lost!
[Procedure of update]
Downloaded dvm-dm16 fbs_fw1c04.exe is a self-extracting file. Please double-click the icon of dvm-dm16 fbs_fw1c04.exe. Folder in which the file which indicates an operation procedure to be an update program was mentioned [DVMDM16 FBS_FW] is developed. Developed folder [DVMDM16 FBS_FW]] Inside [DVMDM16 FBS_update.html] Please double-click an icon. the update procedure indicated -- following -- surely -- Please update on Windows.
* Download from Buffalo here
* Alternative from Plextor Japan website