CDRLabs.com

Available at Karr Wang's site, http://karr.myweb.hinet.net/ the new "unofficial" firmware is QS09. this firmware appears to have made significant improvements in both reading and write quality.

TY burned at 52x:



TDK (RiTEK TG) burned at 52x:



thank you Karr!

there's also firmware ES0C for LDW-401S.
now we only need the drive!