Re: How to change DVD-ROM speed?

[Jens Axboe]

On Wed, Jun 27 2001, Jeffrey W. Baker wrote:
> I am trying to change the spin rate of my IDE DVD-ROM drive.  My system is
> an Apple PowerBook G4, and I am using kernel 2.4.  I want the drive to
> spin at 1X when I watch movies.  Currently, it spins at its highest speed,
> which is very loud and a large power load.
> 
> /proc/sys/dev/cdrom/info indicates that the speed of the drive can be
> changed.  I use hdparm -E 1 /dev/dvd to attempt to set the speed, and it
> reports success.  However, the drive continues to spin at its highest
> speed.

Linux still uses the old-style SET_SPEED command, which is probably not
supported correctly by your newer drive. Just checking, I see latest Mt
Fuji only lists it for CD-RW. For DVD, we're supposed to do
SET_STREAMING to specify such requirements.

Feel free to implement it :-)

-- 
Jens Axboe