optical driver with ahci bios mode but ata(4) driver

[Paul B. Mahol]

On Mon, Feb 28, 2011 at 8:31 PM, David Demelier
<demelier.david at gmail.com> wrote:
> Hello,
>
> My bios can be set to use IDE emulation or ahci mode, I prefere the ahci
> mode because it's a bit faster.
>
> It's probably stupid to stay with ata(4) driver with the ahci mode, isn't
> it? But with ahci(4) driver you can't burn with burncd(8) and cdrecord just
> fail and break an blank cd for nothing.
>
> I guess this is the correct behavior when trying to use burncd(8) /
> cdcontrol(1) :
>
> markand at Melon ~ $ burncd msinfo
> burncd: ioctl(CDIOREADTOCHEADER): Input/output error
>
> markand at Melon ~ $ cdcontrol info
> cdcontrol: getting toc header: Input/output error
> cdcontrol: Input/output error
>
> But why the optical drive is only affected? If I use ata(4) driver even with
> ahci mode set in the bios, why the hard drive works pretty well?

Are you using atapicam module?