IBM IC25N020ATDA04 Hard Drive Specifications - Page 187

S.M.A.R.T. Enable/Disable Automatic Off-Line subcommand DBh, Feature description, Sector Count

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13.33.1.11 S.M.A.R.T. Enable/Disable Automatic Off-Line (subcommand DBh) This subcommand enables and disables the optional feature that cause the device to perform the set of off-line data collection activities that automatically collect attribute data in an off-line mode and then save this data to the device's nonvolatile memory. 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. This subcommand also enables and disables the off-line read scanning feature that cause the device to perform the entire read scanning with defect reallocation as the part of the off-line data collection activities. The Sector Count register shall be set to specify the feature to be enabled or disabled. Sector Count 00h 01h F8h F9h Feature description Disable Automatic Off-line Disable Off-line Read Scanning Enable Automatic Off-line Enable Off-line Read Scanning A value of zero - written by the host into the device's Sector Count register before issuing this subcommand - shall cause the automatic off-line data collection 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, during a power-off sequence, or during an error recovery sequence. A value of one written by the host into the device's Sector Count register before issuing this subcommand shall cause the off-line read scanning feature to be disabled. The Device does not perform the off-line read scanning at the off-line data collection activities which is initiated by the S.M.A.R.T. Execute Off-line Immediate(Subcommand D4h) or automatically if the off-line read scanning feature is disabled. A value of F8h - written by the host into the device's Sector Count register before issuing this subcommand - shall cause the automatic Off-line data collection feature to be enabled. A value of F9 written by the host into the device's Sector Count register before issuing this subcommand shall cause the off-line read scanning feature to be enabled. The Device perform the off-line read scanning at the off-line data collection activities which is initiated by the S.M.A.R.T. Execute Off-line Immediate (Subcommand D4h) even if the automatic off-line feature is disabled. Any other non-zero value - written by the host into this register before issuing this subcommand - is vender specific and will not change the current Automatic Off-Line Data Collection and Off-line Read Scanning status. However, the device may respond with the S.M.A.R.T. error code specified in Figure 128 on page 185. Travelstar 48GH, 30GN & 15GN hard disk drive specifications 173

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13.33.1.11 S.M.A.R.T. Enable/Disable Automatic Off-Line (subcommand DBh)
This subcommand enables and disables the optional feature that cause the device to perform the set of
off-line data collection activities that automatically collect attribute data in an off-line mode and then save
this data to the device's nonvolatile memory. This subcommand may either cause the device to automa-
tically initiate or resume performance of its off-line data collection activities or cause the automatic off-line
data collection feature to be disabled. This subcommand also enables and disables the off-line read
scanning feature that cause the device to perform the entire read scanning with defect reallocation as the
part of the off-line data collection activities.
The Sector Count register shall be set to specify the feature to be enabled or disabled.
Enable Off-line Read Scanning
F9h
Enable Automatic Off-line
F8h
Disable Off-line Read Scanning
01h
Disable Automatic Off-line
00h
Feature description
Sector Count
A value of zero — written by the host into the device's Sector Count register before issuing this
subcommand — shall cause the automatic off-line data collection 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, during a power-off sequence, or during an error
recovery sequence.
A value of one written by the host into the device's Sector Count register before issuing this subcommand
shall cause the off-line read scanning feature to be disabled. The Device does not perform the off-line
read scanning at the off-line data collection activities which is initiated by the S.M.A.R.T. Execute Off-line
Immediate(Subcommand D4h) or automatically if the off-line read scanning feature is disabled.
A value of F8h — written by the host into the device's Sector Count register before issuing this
subcommand — shall cause the automatic Off-line data collection feature to be enabled.
A value of F9 written by the host into the device's Sector Count register before issuing this subcommand
shall cause the off-line read scanning feature to be enabled. The Device perform the off-line read
scanning at the off-line data collection activities which is initiated by the S.M.A.R.T. Execute Off-line
Immediate (Subcommand D4h) even if the automatic off-line feature is disabled.
Any other non-zero value — written by the host into this register before issuing this subcommand — is
vender specific and will not change the current Automatic Off-Line Data Collection and Off-line Read
Scanning status. However, the device may respond with the S.M.A.R.T. error code specified in
Figure 128 on page 185.
Travelstar 48GH, 30GN & 15GN hard disk drive specifications
173