> i just booted a recent knoppix-cd (4.0.2) and i'm trying to enable DMA,
> but it won't work!
> 
> I started qemu with that command:
> 
> qemu -m 256 -cdrom knoppix.iso -boot d
> 
> But inside knoppix, a "hdparm -d1 /dev/hdc" won't work:
>   HDIO_SET_DMA failed: Operation not permitted

Ah ha! DMA mode work for harrdisks, but not for cdroms.

Strange - why?

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