AOpen used to rebadge Ricoh drives. They even tried their designs (1608, etc) but the results weren't that great. They then partnered with Lite-On in late 2005. Since then, they've all been Lite-On rebadges.
From an old DigiTimes article:
AOpen claims that it expects to turn profitable in the first quarter of 2006 after forming a strategic alliance with Lite-On Technology. AOpen will still keep its ODD product line, which currently contributes about 30% to its business and ships 300,000 units monthly, the company said. The cooperation with Lite-On is expected to help AOpen avoid higher production costs and patent fees while ramping up its production output.