ATAPI Shadow Registers on Non-existent Slave Drives

Rob Sims robsims at hootie.lvld.hp.com
Mon May 4 13:07:01 PDT 1998


* From the T10 (formerly SCSI) Reflector (t10 at symbios.com), posted by:
* Rob Sims <robsims at hootie.lvld.hp.com>
*

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Ken Wolfgang wrote on 4/29/98 9:53 am:

>It appears that several of 
>the newer ATAPI drives 
>(especially DVD-ROM drive) 
>are no longer following the 
>specification for shadowing 
>the registers of a 
>non-existent slave drive.  It 
>appears they are either 
>tri-state in the reads of the 
>non-existent drives register 
>or are driving FFH as the 
>shadow register.  Has this 
>requirement been removed 
>from the specification?  And 
>if so, is there a new 
>specification that deals with 
>this situation?

I don't believe anything has changed.  The correct group for this question is T13, which I added to the distribution.

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