[ltp] Controlling dvd-drive speed

[Marius Gedminas]

On Thu, Apr 10, 2003 at 09:48:35PM +0200, Tino Keitel wrote:
> > Any error messages?  Do you have write permissions on the device?
> 
> Running as root, setcd reported that the speed was set to the desired
> value.

It always does that, even if I request 38 Mbytes/s with setcd -x 255 :-)
Only cdrecord -prcap reports the true speed.

> I tried with a CDROM now and it worked with both drives.
> 
> What I noticed is that DVD play speed is not affected by setcd.

Perhaps that's a different setting?  I never actually tried setcd with a
DVD disc, my drive is just not too noisy playing them.

> However, the SD-R 2412 is very silent while playing a DVD, whereas the
> SD-C2512 makes a lot of noise, making it very hard to enjoy watching a
> movie. When I tried to read to read a DVD (not playing it) using
> 
> dd if=/dev/cdroms/cdrom1 of=/dev/null bs=1024
> 
> it runs with full speed, regardless of the setcd -x setting.

BTW the speed setting is reset to the default after you load a different
disc.  Did you try setcd before inserting a DVD, or did you try it after
it was already loaded?

Marius Gedminas
-- 
Eagleson's Law:
        Any code of your own that you haven't looked at for six or more
        months, might as well have been written by someone else.  (Eagleson
        is an optimist, the real number is more like three weeks.)
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