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DISK DRIVE OPERATION
SpinPoint V40 Product Manual
71
6.4.23 Standby (96h,E2h)
This command causes the drive to set BSY, enter the Standby Mode, clear BSY, and assert INTRQ. INTRQ
is asserted even though the device may not have fully transitioned to Standby Mode.
If the Sector Count register is non-zero, then the Standby Timer is enabled. The value in the Sector Count
register shall be used to determine the time programmed into the Standby Mode.
The value in the Sector Count register when the STANDBY command is issued shall determine the time
period programmed into the Standby Timer. See Table 6-7.
6.4.24 SMART (B0h)
Individual SMART commands are identified by the value placed in the Feature resister. Table 6-10 shows
these Feature register values.
Table 6-10 SMART Feature register values
Value Command
00h-CFh Reserved
D0h SMART READ DATA
D1h SMART READ ATTRIBUTE THRESHOLDS
D2h SMART ENABLE/DISABLE ATTRIBUTE AUTOSAVE
D3h SMART SAVE ATTRIBUTE VALUES
D4h SMART EXECUTE OFF-LINE IMMEDIATE
D5h SMART READ LOG SECTOR
D6h SMART WRITE LOG SECTOR
D7h Obsolete
D8h SMART ENABLE OPERATIONS
D9h SMART DISABLE OPERATIONS
DAh SMART RETURN STATUS
DBh SMART ENABLE / DISABLE AUTOMATIC OFF-LINE
DCh-DFh Reserved
E0h-FFh Vendor specific
6.4.24.1 Smart disable operation (D9h)
This command disables all SMART capabilities within the device including any and timer and event count
functions related exclusively to this feature. After receipt of this command the device shall disable all
SMART operations. SMART data shall no longer be monitored or saved by the device. The state of SMART
(either enabled or disabled) shall be preserved by the device across power cycles.
After receipt of this command by the device, all other SMART commands (including SMART DISABLE
OPERATIONS commands), with the exception of SMART ENABLE OPERATIONS, are disabled and
invalid and shall be command aborted by the device.