Sony's DRXUL makes the current thumb-wrestling over Sony also offers an otherwise identicalinternal version, the DRUA. Sony. Model. Cache. Buffer Underrun. Write Speed. Comments. DRUA. ATAPI. 8 MB. Yes. 1x CLV, 2x CLV. UDMA support. DRUUL. Firewire. Download the DRUA/DRXUL updater to your hard disk, unzip the file, and then perform the procedure Sony Corporation. All rights reserved.