To my knowledge, the CH10LS20 and the UH10LS20 are the same exact drive. For some reason, LG lists the CH10 as a retail, over the counter disc drive and the UH10 is listed under their "Commercial" listing. No one has yet to find any differences in the drives. Both have ONE year warranties...and the firmwares are the same, just named differently. Your guess is as good as anyone else. All in all...write quality on this drive is very very nice. I also have a Pioneer BDR-205 and they both have great output.