Hitachi IC25N040ATCS04-0 Specifications - Page 182
Feature Description, Sector Count
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UPC - 683728198664
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Page 182 highlights
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 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 Figure 133 on page 181. Hitachi Travelstar 60GH & 40GN hard disk drive specifications 169
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