IBM DTLA-305040 Hard Drive Specifications - Page 180

SMART Return Status Subcommand DAh, SMART Enable/Disable Automatic Off-line Subcommand

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Non-self-preserved Attribute Values will no longer be monitored. The state of S.M.A.R.T. (either enabled or disabled) is preserved by the device across power cycles. Upon receipt of the SMART Disable Operations subcommand from the host the device disables S.M.A.R.T. capabilities and functions and then saves any updated Attribute Values to the Attribute Data sector. After receipt of the device of the SMART Disable Operations subcommand from the host all other S.M.A.R.T. subcommands - with the exception of SMART Enable Operations - are disabled and invalid and will be aborted by the device (including the SMART Disable Operations subcommand), returning the error code as specified in Figure 138 on page 0. Any Attribute Values accumulated and saved to volatile memory prior to receipt of the SMART Disable Operations command will be preserved in the Attribute Data Sectors of the device. If the device is re-enabled, these Attribute Values will be updated as needed upon receipt of a SMART Read Attribute Values or SMART Save Attribute Values command. 12.32.10 SMART Return Status (Subcommand DAh) This command is used to communicate the reliability status of the device upon the request of the host. Upon receipt of the SMART Return Status subcommand the device saves any updated Pre-failure type Attribute Values to the reserved sector and compares the updated Attribute Values to the Attribute Thresholds. If the device does not detect a Threshold Exceeded Condition, the device loads 4Fh into the Cylinder Low register and C2h into the Cylinder High register. If the device detects a Threshold Exceeded Condition, the device loads F4h into the Cylinder Low register and 2Ch into the Cylinder High register. 12.32.11 SMART Enable/Disable Automatic Off-line (Subcommand DBh) This subcommand enables and disables the optional feature that causes the device to perform the set of off-line data collection activities that automatically collect attribute data in an off-line mode and then saves this data to the nonvolatile memory of the device. This subcommand may either cause the device to automatically initiate or resume performance of its off-line data collection activities or cause the Automatic Off-line Data Collection feature to be disabled. A value of zero written by the host into the Sector Count register of the device before issuing this subcommand causes the feature to be disabled. Disabling this feature does not preclude the device from saving attribute values to nonvolatile memory during some other normal operation such as during a power-on or power-off sequence or during an error recovery sequence. A value of F8h written by the host into the Sector Count register of the device before issuing this subcommand causes this feature to be enabled. Any other non-zero value written by the host into this register before issuing this subcommand is vender specific and does not change the current Automatic Off-line Data Collection status, but the device may respond with the error code specified in Figure 138 on page 0. Deskstar 40GV & 75GXP hard disk drive specifications 168

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Non-self-preserved Attribute Values will no longer be monitored. The state of S.M.A.R.T. (either enabled
or disabled) is preserved by the device across power cycles.
Upon receipt of the SMART Disable Operations subcommand from the host the device disables
S.M.A.R.T. capabilities and functions and then saves any updated Attribute Values to the Attribute Data
sector.
After receipt of the device of the SMART Disable Operations subcommand from the host all other
S.M.A.R.T. subcommands – with the exception of SMART Enable Operations – are disabled and invalid
and will be aborted by the device (including the SMART Disable Operations subcommand), returning the
error code as specified in Figure 138 on page 0.
Any Attribute Values accumulated and saved to volatile memory prior to receipt of the SMART Disable
Operations command will be preserved in the Attribute Data Sectors of the device. If the device is
re-enabled, these Attribute Values will be updated as needed upon receipt of a SMART Read Attribute
Values or SMART Save Attribute Values command.
12.32.10
SMART Return Status (Subcommand DAh)
This command is used to communicate the reliability status of the device upon the request of the host.
Upon receipt of the SMART Return Status subcommand the device saves any updated Pre-failure type
Attribute Values to the reserved sector and compares the updated Attribute Values to the Attribute
Thresholds.
If the device does not detect a Threshold Exceeded Condition, the device loads 4Fh into the Cylinder
Low register and C2h into the Cylinder High register.
If the device detects a Threshold Exceeded Condition, the device loads F4h into the Cylinder Low
register and 2Ch into the Cylinder High register.
12.32.11
SMART Enable/Disable Automatic Off-line (Subcommand
DBh)
This subcommand enables and disables the optional feature that causes the device to perform the set of
off-line data collection activities that automatically collect attribute data in an off-line mode and then saves
this data to the nonvolatile memory of the device. This subcommand may either cause the device to auto-
matically initiate or resume performance of its off-line data collection activities or cause the Automatic
Off-line Data Collection feature to be disabled.
A value of zero written by the host into the Sector Count register of the device before issuing this sub-
command causes the feature to be disabled. Disabling this feature does not preclude the device from
saving attribute values to nonvolatile memory during some other normal operation such as during a
power-on or power-off sequence or during an error recovery sequence.
A value of F8h written by the host into the Sector Count register of the device before issuing this
subcommand causes this feature to be enabled. Any other non-zero value written by the host into this
register before issuing this subcommand is vender specific and does not change the current Automatic
Off-line Data Collection status, but the device may respond with the error code specified in Figure 138 on
page 0.
Deskstar 40GV & 75GXP hard disk drive specifications
168