hdparm question: HDIO_SET_DMA failed: Inappropriate ioctl for device
jspaleta at gmail.com
Tue Nov 27 01:41:50 UTC 2007
On Nov 26, 2007 4:30 PM, Antonio Olivares <olivares14031 at yahoo.com> wrote:
> If one enables hdparm DVD playback will not be jumpy, however when applying hdparm I get
Perhaps the libata faq will give you the most basic answer
Now are you sure that the drive isn't already using dma by default?
hdparm -i /dev/cdrom
will list the supported DMA modes and will indicate which one is
currently in use. By default my DVD drive has the most advanced DMA
enabled by default
DMA modes: sdma0 sdma1 sdma2 mdma0 mdma1 mdma2
UDMA modes: udma0 udma1 *udma2
* signifies the current active mode
As to why hdparm is attempting to use the legacy ioctls, that I have no idea.
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