Zdenek Salvet wrote:
> Yes, SCSI-3 has such command ("read at XX kB/s or slower"),
> although it is marked obsolete in current version of the standard.

I need more of 'do not try to upgrade to faster speed
if read on slow speed succeeds'.

> It's possible, but may be undesirable with better drive reading scratched CD.
> I can create manual CD speed control for you if you still want it.
> (Adaptive driver would be more work and tuning).

Yes, I want, thanks :) I've started looking at SCSI-2 specs
and NetBSD scsipi subsystem. So far, I discovered the SCSI commands to
get/set
error recovery mechanism of the device, but I haven't yet found anything
to actually adjust the speed of CD-ROM drive :-/

Jaromir