[t10] op x23 of PDT x00 practically not vendor-specific

Pat LaVarre LAVARRE at iomega.com
Mon Apr 7 15:33:20 PDT 2003


* From the T10 Reflector (t10 at t10.org), posted by:
* "Pat LaVarre" <LAVARRE at iomega.com>
*
> so technically speaking, our merely public PDT x00
> standard is not incorrect.
 
Ouch.  I was hoping this was an RMB issue only.
 
Offline kindly I'm told Microsoft's Win XP
sends op x23 Read Format Capacities
to non-removable HDD as well.
 
Ouch.
Ouch.
Ouch.
 
Pat LaVarre

	-----Original Message----- 
	From: Pat LaVarre 
	Sent: Tue 4/1/2003 5:21 PM 
	To: t10 at t10.org 
	Cc: 
	Subject: RE: [t10] op x23 of PDT x00 practically not vendor-specific
	
	

	* From the T10 Reflector (t10 at t10.org), posted by: 
	* "Pat LaVarre" <LAVARRE at iomega.com> 
	* 
	Help?  I'm not sure what you mean. 
	  
	If you will allow me to misquote some ' ' as '.' I can 
	say in http://www.t10.org/lists/op-alph.htm I see: 
	  
	as of 2/11/03 
	..  DTLPWRSOMCAEBK 
	23  .....O........  READ FORMAT CAPACITIES 
	  
	I think R = O means op x23 is not vendor-specific for 
	PDT x05 = R.  I agree with that, sure, but I mean to 
	be saying op x23 isn't really vendor-specific for PDT 
	x00 = D. 
	  
	Ok, so technically speaking, our merely public PDT x00 
	standard is not incorrect. 
	  
	We can say some host vendors who massively distribute 
	their stuff have chosen to ab/use PDT x00 op x23 in a 
	certain way and a large number of device vendors have 
	chosen to play along with this ab/use. 
	  
	But we might confuse less people if we change the next 
	rev of SBC to admit that here the de facto PDT x00 
	standard has departed from the de jure PDT x00 standard. 
	  
	Personally I'm vague on the proper spec-ese.  We need 
	a polite way to say, uh, yea, we stole a 
	vendor-specific op back, sorry about that. 
	  
	Rather than baldly stealing it back, maybe we should 
	just add an implementation note: "Some SBC device 
	vendors choose to define the vendor-specific op x23 as 
	MMC does." 
	  
	No? 
	  
	Cluelessly, curiously, thankfully yours, Pat LaVarre 

	        -----Original Message----- 
	        From: David Dillard [mailto:david.dillard at veritas.com] 
	        Sent: Tue 4/1/2003 5:09 PM 
	        To: Pat LaVarre; t10 at t10.org 
	        Cc: 
	        Subject: RE: [t10] op x23 of PDT x00 practically not vendor-specific 
	        
	        

	        You would seem to be correct.  See http://www.t10.org/lists/op-alph.htm 
	        
	        
	        
	        > -----Original Message----- 
	        > From: Pat LaVarre [mailto:LAVARRE at iomega.com] 
	        > Sent: Tuesday, April 01, 2003 6:11 PM 
	        > To: t10 at t10.org 
	        > Subject: [t10] op x23 of PDT x00 practically not vendor-specific 
	        > 
	        > 
	        > * From the T10 Reflector (t10 at t10.org), posted by: 
	        > * "Pat LaVarre" <LAVARRE at iomega.com> 
	        > * 
	        > http://www.t10.org/scsi-3.htm 
	        > ftp://ftp.t10.org/t10/drafts/sbc2/sbc2r08.pdf 
	        > 
	        > "The following operation codes are vendor-specific: 
	        > 02h, 05h, 06h, 09h, 0Ch, 0Dh, 0Eh, 0Fh, 10h, 11h, 
	        > 13h, 14h, 19h, 20h, 21h, 22h, 23h, 24h, 26h, 27h, 
	        > 29h, 2Ch, 2Dh, and C0h through FFh." 
	        > 
	        > Except for op x23 we're just kidding.  "Everybody 
	        > knows" RMB PDT x00 often needs op x23 to mean Read 
	        > Format Capacities, as in the SFF 8070i Compaq LS-120 specification. 
	        > 
	        > Have we (T10) ever discussed acknowledging this fact in SBC? 
	        > 
	        > Should we? 
	        > 
	        > Cluelessly, curiously, thankfully yours, Pat LaVarre 
	        > 
	        > * 
	        > * For T10 Reflector information, send a message with 
	        > * 'info t10' (no quotes) in the message body to majordomo at t10.org 
	        > 
	        

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