Very Computer

Hi,

I want to reduce the reading speed of my Plextor Ultraplex to lower
rates like 8x. Plextor deliveres the Plextor Mangager for WIN95/NT, who
make this possible.

Is is possible under LINUX to set the speed of the CDROM by writing a
specific control sequence to the SCSI device ? Does anybody know these
commands?

Thanx

Peter

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Hi,

Quote:> I want to reduce the reading speed of my Plextor Ultraplex to lower
> rates like 8x. Plextor deliveres the Plextor Mangager for WIN95/NT, who
> make this possible.

Yes, but there is no Windows on my computer too. It seems I have the
sameproblem like you. I own a PLEXTOR-32TS. Last week I got read errors on
a
scratched CDDA disc and wanted to reduce speed. The SCSI3-MMC command
doesnt work with Plextor because these cdroms have a non-standard command
set.

Quote:> Is is possible under LINUX to set the speed of the CDROM by writing a
> specific control sequence to the SCSI device ? Does anybody know these
> commands?

Yes, theoretically this is possible. I wrote an EMail to the Plextor
support. Rik Swusten answered:

--- SNIP ---

Dear sir,
We have the SCSI Command set available for manufacturers and developers.
However, this is not a public document.  We require the signature of a
non-Disclosure Agreement to obtain this document, and the information
cannot be made public.
So I am not sure if you can use this information for Linux.
But I know that there are some utilities availble for Linux, please
consult the newsgroups for this.
Best regards,
Rik Swusten.

--- SNIP ---

I dont want to sign an non-Disclosure Agreement. If someone can find out
the control sequence to set the cdrom speed, Plextor cant do anything if
we dont hack their Plextor tools. There might be a way to to this legally
:

If someone gets their tools to run under the WINE Windows emulator he could
snoop their ASPI calls and have a look at their SCSI control sequences.
Snooping under Windows might be far more difficult - maybe this would be
possible if someone writes his own little ASPI driver. I have no idea of
the ASPI standard and theres no Windows on my computer, too. Is there
anybody wo can do this?

Has anybody heard of the "utilities" Rik Swusten mentioned?

If anybody wants to SIGN this non-Disclosure Agreement it would be possible
to compile this specific commands in a single object file and we could use
this object file to link it to applications which need it. It would not be
legal to disassemble this object file but I think it would be legal to
submit it to the net.

Greetings

Alexander

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Alexander Feigl
Scheffelstra?e 4

D-72555 Metzingen

Homepage : http://members.tripod.com/~lonely_dreamer/