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Re: ata(4) and NCQ

On Apr 26, 2011, at 12:05 PM, Manuel Bouyer <> 

> On Tue, Apr 26, 2011 at 11:52:00AM -0700, Garrett Cooper wrote:
>> [...]
>> I've been watching this discussion and one hing i was curious about was -- 
>> is it widely known that there are a handful of ATA <-> SCSI specs that have 
>> been released by IEEE over the past decade. I figured someone was aware of 
>> this on the list, but was kind of puzzled by the replies about FreeBSD, 
>> Linux and windows behavior when in fact the behavior is allowed and standard.
> Can you gives pointers about this ? AFAIK ata is still something
> different from SAM or SPC.

Not sure what SAM means, but there is partial implementation of SPC in the ata 
<-> SCSI spec. I'll dig up the spec when I get back home this coming weekend, 
but it's easy to find on the IEEE site and wasn't that expensive to obtain. It 
broke down how ata should function in "SCSI emulation mode".

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