I found out that the Asus SDRW-0804P-D is the same like Pioneer DVR-K14L.
The DVR-K14L has only the latest version 1.10 or the Firmware and this drive makes a lot of problems reading and writing CD-R/RW, DVD-R/RW and DVD+R/RW.
The Asus one have a new firmware with the Version 1.12 look here to download the firmware:
The question can anybody change this firmware to flash it to the DVR-K14L.
It will be great to flash the drive to a new firmware.