From: Vancouver, B.C. Canada
I think another reason that Sanyo has a section where others do not, is because Sanyo, like LiteON, Plextor, and Yamaha, offers specialized tools that may require additional assistance, and usually those tools only work on THAT specific drive make (although some cross compatabilities exist from time to time).
And don't forget that a lot of drives use Sanyo technology, or are Sanyo OEMs.
Canada; Leading the world in being just north of the U.S.A.