Which brand of printable media are you using currently?
The DW-U10A is the OEM version of the DRU-500A. Sony's support page with some recommended media is here (it's over a year old, however):
Recommended media
Because your drive is a few years old, it may need a firmware update to work with some newer media. If you scroll down a bit on Sony's
storage support page for this drive, you'll see a link to the latest firmware. This is PC firmware, but supposedly the
DVRFlash utility will be able to flash OEM Sony drives as well. I have not tried it with anything other than Pioneer drives, though.