Travelstar 80GN Hard Disk Drive Specification
165
The Sector Count register shall be set to specify the feature to be enabled or disabled:
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 (Subcom-
mand 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 nonzero value written by the host into this register before issuing this subcommand is vendor 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 error code specified in Table 121: “S.M.A.R.T. Error Codes” on page 175.
Sector Count
Feature Description
00h
Disable Automatic Off-line
01h
Disable Off-line Read Scanning
F8h
Enable Automatic Off-line
F9h
Enable Off-line Read Scanning
Summary of Contents for IC25N020ATMR04
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