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Yes, I do propose adding CLARIFICATION language ( much like you put in red)
to the DCO definition.
This is not changing any functionality, but only adding a more complete
explanation
of what is already there.
For this reason, I don't even consider it worth an official 'erratum'
publication.
I would, however, certainly want to change ATA8-ACS.
-----
The 'overlay' part of the name comes from the fact that the DCO function
allows the device to 'mask' or 'overlay with a new definition' some data
that would otherwise be reported to the host.
DCO data overrides/overlays 'normal' configuration data, and is saved in a
different
location than the 'default' data (because the defaults may be restored
by removing DCO restrictions)
-----------
Thank You !!!
-----------------------------------------------------------------
Jim Hatfield
Seagate Technology LLC
e-mail: [EMAIL PROTECTED]
s-mail: 389 Disc Drive; Longmont, CO 80503 USA
voice: 720-684-2120
fax....: 720-684-2711
==========================================
Joseph Chen
<[EMAIL PROTECTED]
ung.com> To
No Phone Info [EMAIL PROTECTED],
Available [email protected]
cc
04/25/2005 03:02 Subject
PM RE: DCO Questions
Please respond to
[EMAIL PROTECTED]
ng.com
Hi Jim,
No I do not agree with your suggestion because you are proposing change
the definition of "DCO." If your suggestion is true the ATA-7 spec would
have to be modified as:
In the ATA-7 DCO command it states: "If a DEVICE CONFIGURATION
SET
command has been issued reducing the capabilities, the response
to
an IDENTIFY DEVICE or IDENTIFY PACKET DEVICE command <or SMART
Read Data command> (added test) will reflect
the reduced set of capabilities, while the DEVICE CONFIGURATION
IDENTIFY command will reflect the entire set of selectable
capabilities." (section 6.10.3.8 of v1)
The DCO is created in ATA-6 to enable changing the Identify
Device/Identify Packet Device command settings. As it is stated in the
DCO definition in the ATA-7 section 4-15:
4.15 Device Configuration Overlay feature set
The optional Device Configuration Overlay feature set allows a
utility
program to modify some of the optional commands, modes, and
feature
sets that a device reports as supported in the IDENTIFY DEVICE
or
IDENTIFY PACKET DEVICE command response as well as the capacity
reported.
I donât know where the word âoverlayâ came from, I only guess that this
is an overlay structure for IDENTIFY DEVICE/IDENTIFY PACKET DEVICE.
Regards,
Joseph
The topic did come up at the meeting, and I took an action item to
clarify this issue.
-------------------------
You are correct in that IDENTIFY does not indicate whether or not
selective self-test and conveyance self-tests are supported.
This indication is, instead, found in the results passed back to the
host from the SMART READ DATA command.
(reference ATA/ATAPI-7, rev 4b, volume 1)
> http://t13.org/docs2004/d1532v1r4b-ATA-ATAPI-7.pdf
Please refer to Table 49 - Device SMART data structure
word 367 - offline data collection capability
Refer to section 6.54.5.12 Off-line data collection capabilities
- Bit 5 (conveyance self-test implemented bit) - If this bit is
cleared to zero, the device does not implement
the Conveyance self-test routines. If this bit is set to one, the
device implements the Conveyance selftest
routines.
- Bit 6 (Selective self-test implemented bit) - If this bit is
cleared to zero, the device does not implement the
Selective self-test routine. If this bit is set to one, the device
implements the Selective self-test routine.
---------
Since we already report the data you desire, I would (personally) not
favor inventing bits in IDENTIFY, but would favor better documentation
in DCO of where to find the associated indicators.
Thank You !!!
-----------------------------------------------------------------
Jim Hatfield
Seagate Technology LLC
e-mail: [EMAIL PROTECTED]
s-mail: 389 Disc Drive; Longmont, CO 80503 USA
voice: 720-684-2120
fax....: 720-684-2711 ==========================================
----- Forwarded by James C Hatfield/Seagate on 04/25/2005 12:18 PM -----
Joseph Chen -
SISA
<[EMAIL PROTECTED]
To
ng.com> [EMAIL PROTECTED],
No Phone Info [EMAIL PROTECTED]
Available
cc
Subject
04/25/2005 11:43 RE: DCO Questions
AM
Hi Dan and Jim,
Did you cover this question in the last week's T13 meeting? I would
like
to know the result from the discussion.
Regards,
Joseph
-----Original Message-----
From: Joseph Chen [mailto:[EMAIL PROTECTED]
Sent: Thursday, March 31, 2005 2:33 PM
To: [email protected]
Subject: DCO Questions
Hi,
In the ATA-7 DCO command it states: "If a DEVICE CONFIGURATION
SET
command has been issued reducing the capabilities, the response
to
an IDENTIFY DEVICE or IDENTIFY PACKET DEVICE command will
reflect
the reduced set of capabilities, while the DEVICE CONFIGURATION
IDENTIFY command will reflect the entire set of selectable
capabilities." (section 6.10.3.8 of v1)
Among the various DCO setting I would like to know how to
identify
the setting of word 7 bit 12, Reporting support for SMART
Selective self-test is allowed, and word 7 bit 13, Reporting
support for Conveyance self-test is allowed. I couldn't find
the
support bits in the Identify command.
If they are not exist, I propose an addition to the ATA-8 spec
to
add two bits in the Identify command to show if these DCO
features
are supported.
Regards,
Joseph
Regards,
Joseph
