Protection Modes in SCSI devices

Gerry.Houlder at Gerry.Houlder at
Mon Jun 12 11:14:44 PDT 2006

* From the T10 Reflector (t10 at, posted by:
* Gerry.Houlder at
Like all INQUIRY bits, these bits are set by the SCSI device to indicate
its capability for the function. These will always be set in a device that
is capable of supporting the function. To tell whether the capability has
been invoked or not you must use READ CAPACITY(16) and interpret the bits
returned there.
	     Gary.Franco at emule													   
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				       Protection Modes in SCSI devices    
	     06/12/2006 09:34						   
I have a question with regard to the discussion in SPC4r04
In clause 7.6.4 Extended INQUIRY Data VPD page, there are 3 bits discussed
      APP_CHK and
They are defined as far as their meaning, but never discussed how they are
set. Is this part of the format process, or simply the capability of the
device firmware or design?
Any Help?
Gary Franco Consultant Engineer
Emulex Network Systems
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