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

Elliott, Robert (Server Storage) Elliott at hp.com
Thu Feb 18 16:16:15 PST 2010


* From the T10 Reflector (t10 at t10.org), posted by:
* "Elliott, Robert (Server Storage)" <Elliott at hp.com>
*
Figure 10 contains an error too.  In the bottom half:
   ATA: LOGICAL SECTORS PER PHYSICAL SECTOR field set to 1h
   SCSI: LOGICAL BLOCKS PER PHYSICAL BLOCK field set to 1h
   (indicating 2^3 logical blocks per physical block):
should be:
   ATA: LOGICAL SECTORS PER PHYSICAL SECTOR field set to 3h
   SCSI: LOGICAL BLOCKS PER PHYSICAL BLOCK field set to 3h
   (indicating 2^3 logical blocks per physical block):
---
Rob Elliott    HP ISS Platform Technology - Server Storage
From: owner-t10 at t10.org [mailto:owner-t10 at t10.org] On Behalf Of James C
Hatfield
Sent: Tuesday, February 09, 2010 6:20 PM
To: T10 Reflector
Cc: Marc A Noblitt; Mary Dunn
Subject: Error in the published version of SAT-2 --- 4K alignment impact
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
  s-mail:  389 Disc Drive;  Longmont, CO 80503 USA
  voice:  720-684-2120
  fax....: 720-684-2766
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