Error in the published version of SAT-2 --- 4K alignment impact

James C Hatfield james.c.hatfield at seagate.com
Tue Feb 9 16:19:51 PST 2010


Formatted message: <a href="http://www.t10.org/cgi-bin/ac.pl?t=r&f=r1002093_f.htm">HTML-formatted message</a>

All,
I just discovered an error in SAT-2 that was not caught in letter ballot
reviews.
Mark Overby checked and it is in the official ANSI revision as well.
We need to fix it in SAT-3, and (most importantly)
*  anyone who implements multiple logical sectors per physical sector (e.g.,
4K emulation) should be aware of the error
========================================================================
Reference:
      SAT2R09	      16 September 2009 	T10/1826-D Revision 09
      Section 5.7, Figure 8
	   (The upper part of Figure 8 - <<not the lower part of Figure 8>>)
========================================================================
Figure 8 — Logical Sector Alignment Examples (part 1 of 3)
ATA: LOGICAL SECTORS PER PHYSICAL SECTOR field set to 1h
SCSI: LOGICAL BLOCKS PER PHYSICAL BLOCK field set to 1h
(indicating 21 logical blocks per physical block):
ATA: LOGICAL SECTOR ALIGNMENT field set to 1h:
SCSI: LOWEST ALIGNED LOGICAL BLOCK ADDRESS field set to 1h:
========================================================================
========================================================================
Corrections needed:
========================================================================
  a) the LOGICAL SECTOR ALIGNMENT field 			    should
be 0h (not 1h)
  b) the LOWEST ALIGNED LOGICAL BLOCK ADDRESS field    should be 0h (not 1h)
Thank You !!!
-----------------------------------------------------------------
Jim Hatfield
Seagate Technology LLC
  e-mail:  James.C.Hatfield at seagate.com
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