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Old 05-10-2001, 11:49 AM   #1
Thymox
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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.
 
Old 11-15-2001, 09:33 AM   #2
Thymox
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Just came across this nice old post of mine.

Anyway, still can't figure this out.
 
Old 11-15-2001, 07:55 PM   #3
Aussie
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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.
 
Old 11-19-2001, 10:28 AM   #4
Thymox
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Cheers, that actually makes a lot of things much clearer.
 
Old 11-19-2001, 05:24 PM   #5
Aussie
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Glad to be of some help
 
Old 11-19-2001, 06:49 PM   #6
drjimstuckinwin
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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

Last edited by drjimstuckinwin; 11-19-2001 at 06:51 PM.
 
Old 11-19-2001, 08:53 PM   #7
Dayewalker
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It all makes sense now, thanks. After reading the first few replies to this thread, I was kinda lost.
 
  


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