Samsung 3.5" hard disk drives manual Standby 96h,E2h, Smart B0h, Smart disable operation D9h

DISK DRIVE OPERATION

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 6-10SMART 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

6.4.24.1Smart 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.

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