I wonder why there is a command to turn on DMA on disks.  Could
it be that some disks don't work with DMA on?

        Sape
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 Ran into an interesting one setting up my cpu server. The following
reliably freezes the box:

# echo dma on >/dev/sdC0/ctl
# 9fat:

 Leaves the console totally unresponsive, no ^T^Tp, no ^P. rc -x on
9fat: gives "rfork e" as the final command.
 sdC0 is a cdrom. I can turn dma on for my sata disks (sdE0/sdF0) no problem.
-sqweek

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