Hitachi C4K60 Specifications - Page 106

7.5.45. SMART Enable/Disable Automatic Off-line [B0h, Sub DBh] Task File Registers Command LBA High LBA Mid LBA Low Device/Head Sector Count Features 7 6 5 4 3 2 1 0 B0h C2h 4Fh XX X X X DRV X X X X 00h: Disable, F8h: Enable DBh SMART ENABLE / DISABLE AUTOMATIC OFF-LINE command enables and disables the Automatic Off-line feature. if Automatic Off-line is enabled, the device automatically correct attribute data in an off-line mode periodically and save the attribute data on the disk. - The Sector Count Register is set to 00h to disable Automatic collection of Off-line data - The Sector Count Register is set to F8h to enable Automatic collection of Off-line data The following tests are performed for the Automatic off-line feature: a) Raw Read Error Rate Measurement Partial read scanning and Raw Read Error Rate measurement is performed. This event is occurred every 24 POH's and 2 minutes of host inactivity. b) Automatic sector reallocation in off-line read scanning for entire LBA. This event occurs every 168 POH's and 2 minutes of host inactivity. Enable state is preserved until receiving a disable automatic off-line command. Upon receipt of the SMART Enable/Disable automatic Off-line command, the device sets BSY to one, enables or disables the automatic off-line data correction feature, clear BSY to zero and asserts INTRQ. During execution of its off-line data collection activities and saving the data on the disk, DRDY and BSY are set to zero. A command is issued during execution of its off-line data collection activities and saving the data on the disk, the device will respond to the host within two seconds. K6610170 Rev.2 Dec 22, 2004 - 106 -