IBM DTTA-351010 Hard Drive Specifications - Page 156

SMART Enable/Disable Attribute Autosave Subcommand D2h

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12.31.1.1 SMART Read Attribute Values (Subcommand D0h) This subcommand returns the device's Attribute Values to the host. Upon receipt of the SMART Read Attribute Values subcommand from the host, the device saves any updated Attribute Values to the Attribute Data sectors, and then transfers the 512 bytes of Attribute Value information to the host. 12.31.1.2 SMART Read Attribute Thresholds (Subcommand D1h) This subcommand returns the device's Attribute Thresholds to the host. Upon receipt of the SMART Read Attribute Thresholds subcommand from the host, the device reads the Attribute Thresholds from the Attribute Threshold sectors, and then transfers the 512 bytes of Attribute Thresholds information to the host. 12.31.1.3 SMART Enable/Disable Attribute Autosave (Subcommand D2h) This subcommand enables and disables the attribute autosave feature of the device. The SMART Enable/Disable Attribute Autosave subcommand either allows the device to automatically save its updated Attribute Values to the Attribute Data Sector periodically; or this subcommand causes the autosave feature to be disabled. The state of the Attribute Autosave feature (either enabled or disabled) will be preserved by the device across power cycle. A value of 00h written by the host into the device's Sector Count Register before issuing the SMART Enable/Disable Attribute Autosave subcommand will cause this feature to be disabled. Disabling this feature does not preclude the device from saving Attribute Values to the Attribute Data sectors during some other normal operation such as during a power-up or power-down. A value of F1h written by the host into the device's Sector Count Register before issuing the SMART Enable/Disable Attribute Autosave subcommand will cause this feature to be enabled. Any other non-zero value written by the host into this register before issuing the SMART Enable/Disable Attribute Autosave subcommand will not change the current Autosave status but the device will respond with the error code specified in Figure 119 on page 156. The SMART Disable Operations subcommand disables the autosave feature along with the device's SMART operations. Upon the receipt of the subcommand from the host, the device asserts BSY, enables or disables the Autosave feature, clears BSY and asserts INTRQ. 12.31.1.4 SMART Save Attribute Values (Subcommand D3h) This subcommand causes the device to immediately save any updated Attribute Values to the device's Attribute Data sector regardless of the state of the Attribute Autosave feature. Upon receipt of the SMART Save Attribute Values subcommand from the host, the device writes any updated Attribute Values to the Attribute Data sector. 12.31.1.5 SMART Execute Off-line Data Collection (Subcommand D4h) This subcommand causes the device to immediately initiate or resume the set of activities that collect Attribute data in an off-line mode. If the device is in the process of performing its set of off-line activities as a result of receiving a S.M.A.R.T. Execute Off-line Data Collection subcommand from the host and is interrupted by a new command from the host, the device will abort its off-line activities and service the host within two seconds after receipt of the new command. The device requires a new S.M.A.R.T. Execute Off-line Data Collection subcommand from the host to restart Off-line data collection activity. 148 OEM Specifications for DTTA-3xxxxx

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12.31.1.1
SMART Read Attribute Values (Subcommand D0h)
This subcommand returns the device's Attribute Values to the host. Upon receipt of the SMART Read
Attribute Values subcommand from the host, the device saves any updated Attribute Values to the Attribute
Data sectors, and then transfers the 512 bytes of Attribute Value information to the host.
12.31.1.2
SMART Read Attribute Thresholds (Subcommand D1h)
This subcommand returns the device's Attribute Thresholds to the host. Upon receipt of the SMART Read
Attribute Thresholds subcommand from the host, the device reads the Attribute Thresholds from the Attri-
bute Threshold sectors, and then transfers the 512 bytes of Attribute Thresholds information to the host.
12.31.1.3
SMART Enable/Disable Attribute Autosave (Subcommand D2h)
This
subcommand
enables
and
disables
the
attribute
autosave
feature
of
the
device.
The
SMART
Enable/Disable Attribute Autosave subcommand either allows the device to automatically save its updated
Attribute Values to the Attribute Data Sector periodically; or this subcommand causes the autosave feature
to be disabled.
The state of the Attribute Autosave feature (either enabled or disabled) will be preserved by
the device across power cycle.
A value of 00h written by the host into the device's Sector Count Register before issuing the SMART
Enable/Disable Attribute Autosave subcommand will cause this feature to be disabled. Disabling this feature
does not preclude the device from saving Attribute Values to the Attribute Data sectors during some other
normal operation such as during a power-up or power-down.
A value of F1h written by the host into the device's Sector Count Register before issuing the SMART
Enable/Disable Attribute Autosave subcommand will cause this feature to be enabled. Any other non-zero
value written by the host into this register before issuing the SMART Enable/Disable Attribute Autosave
subcommand will not change the current Autosave status but the device will respond with the error code
specified in Figure 119 on page 156.
The
SMART
Disable
Operations
subcommand
disables
the
autosave
feature
along
with
the
device's
SMART operations.
Upon
the receipt of the subcommand
from the
host, the
device asserts BSY, enables or disables the
Autosave feature, clears BSY and asserts INTRQ.
12.31.1.4
SMART Save Attribute Values (Subcommand D3h)
This subcommand causes the device to immediately save any updated Attribute Values to the device's Attri-
bute Data sector regardless of the state of the Attribute Autosave feature. Upon receipt of the SMART Save
Attribute Values subcommand from the host, the device writes any updated Attribute Values to the Attri-
bute Data sector.
12.31.1.5
SMART Execute Off-line Data Collection (Subcommand D4h)
This subcommand causes the device to immediately initiate or resume the set of activities that collect Attri-
bute data in an off-line mode.
If the device is in the process of performing its set of off-line activities as a result of receiving a S.M.A.R.T.
Execute Off-line Data Collection subcommand from the host and is interrupted by a new command from
the host, the device will abort its off-line activities and service the host within two seconds after receipt of the
new command.
The device requires a new S.M.A.R.T. Execute Off-line Data Collection subcommand from
the host to restart Off-line data collection activity.
148
OEM Specifications for DTTA-3xxxxx