Query regarding response of MODE SENSE10 command

Gerry Houlder gerry.houlder at seagate.com
Tue Feb 24 07:05:08 PST 2015

Formatted message: <a href="http://www.t10.org/cgi-bin/ac.pl?t=r&f=r1502241_f.htm">HTML-formatted message</a>

The "changeable values" only apply to parameter bytes within a mode page.
The contents of the Mode Parameter header, Block Descriptor (if any), and
the first few bytes of each mode page (the Page Code, Subpage Code, Page
Length, PS bit, and SPF bit) are the same for all values of the PC field.
On Tue, Feb 24, 2015 at 1:41 AM, Munjal Mistry <munjal_mistry at mentor.com>
> * From the T10 Reflector (t10 at t10.org), posted by:
> * Munjal Mistry <munjal_mistry at mentor.com>
> *
> Hi,
> I have a query regarding mode page transfer with MODE SENSE 10 command
> with PC=01b.
> As per the SPC-4 specification (Topic-6.13.3 Changeable values), device
> returns a mask denoting those mode parameters that are changeable i.e.
> other than changeable parameter's value shall be set to 0.
> Here, my confusion is about the value of first 2 bytes of mode pages which
> indicates {PS, SPF, PAGE CODE} in 1st byte and {PAGE LENGTH} in 2nd byte.
> Will it be driven 0 (as it can't be changed) or it's actual value will be
> driven with PC=01b?
> Similarly, for mode parameter header, what could be the value of {MODE
> DATA LENGTH} field?
> Thank you.
> --
> Warm Regards,
> Munjal Mistry
> *
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