DMA disabled by default for optical drives - why?

[Steve]

On 12/19/05, 'Forum Post <ulist at gs1.ubuntuforums.org> wrote:
>
> Because old drives don't support DMA and it's why, i think, DMA is not
> set by default.
>
>
> --
> frodon

Isn't this a little contradictory? For example, by default IPv6 *is*
enabled, which causes browsing problems for systems without this *new*
technology. However DMA is treated the opposite? I rather need to do
some fiddling to get any *old* hardware to work, than to get current
hardware (probably majority) to work.

Just my opinion...