IBM IC35L020 Hard Drive Specifications - Page 177

S.M.A.R.T. Return Status Subcommand DAh, S.M.A.R.T. Enable/Disable Automatic Off-line, Subcommand DBh

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15.32.10 S.M.A.R.T. 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 S.M.A.R.T. 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. 15.32.11 S.M.A.R.T. 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 a 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 132 on page 174. Deskstar 60 GXP Hard disk drive specification 163

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15.32.10
S.M.A.R.T. 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 S.M.A.R.T. 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.
15.32.11
S.M.A.R.T. 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 a 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 132 on
page 174.
Deskstar
60 GXP Hard disk drive specification
163