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Thymox 05-10-2001 10:49 AM

Does anyone know why Linux (particularly Mandrake as this is the only disto that I've hade much experience with) insists on using SCSI emulation in order to use an IDE CD-burner? It can use IDE HDDs without having to use SCSI emulation for them. It can use IDE CD/DVD drives withouth having to use SCSI emulation for them. Why, when there are plenty of IDE Burners around, does it insist on pretending that it's a SCSI burner?

BTW: Not so much a problem as a query.

Thymox 11-15-2001 08:33 AM

Just came across this nice old post of mine.

Anyway, still can't figure this out.

Aussie 11-15-2001 06:55 PM

From Joerg Schillings ATAPI README ,
Quote:

Many people ask why I use ATAPI-SCSI emulation.

The use of the naming convention "ATAPI-SCSI emulation" is a
little bit misleading. It should rather be called:
"SCSI host adapter emulation"

The ATAPI standard describes method of sending SCSI commands over IDE
with some small limitations to the "real" SCSI standard.
For this reason ATAPI-SCSI emulation is the native method of
supporting ATAPI devices.

Thymox 11-19-2001 09:28 AM

Cheers, that actually makes a lot of things much clearer.

Aussie 11-19-2001 04:24 PM

Glad to be of some help :D

drjimstuckinwin 11-19-2001 05:49 PM

Hi
SCSI = fast and reliable
IDE (before UDMA I guess) = slower and unreliable
CD burner needs constant data flow, as can't stop/start/reposition mid burn.
First CD-R drives were thus SCSI
When they made IDE CD-R, they thought...
"Shall we write a whole load of new commands/drivers, or shall we emulate SCSI over the IDE bus".
And so SCSI emulation happened
Windoze apparently also uses SCSI emulation, you just don't know about it.
Newer drives have big cache, but still use SCSI.
Hope that helps.
Jim

Dayewalker 11-19-2001 07:53 PM

It all makes sense now, thanks. :) After reading the first few replies to this thread, I was kinda lost. :D


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