<< It could be market driven. I do not see ads for 10x RW media either. >>
>> B/C we don't have any drives faster than 10X!!!!!
You need the media first, (to know how well the dye will perform at higher write speeds)
before you can design the drives to take advantage of them.
There are already two standards for CD-RW, based on the Orange Book specs.
One was for the original CD speeds of up to 4x burning, and the second was based on
a different type of dye, which allowed up to 10x burning. The second is packaged
under the "High-Speed" logo to set them apart.
To go to higher speeds with Rewritable media would require yet another standard, incompatible
with the other two, and drives that would also have to handle three types of RW media, as well
as regular CD.
This is very unlikely to happen, as more manufacturers are moving towards DVD Rewritable as the
next step in storage evolution. DVD writing speeds start at 1x DVD (8x CD) and go up to
2x to 2.5x speed (16x to 20x CD equivalent speed) for first gen drives.