SpinPoint Barracuda Series, Product Manual

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Barracuda Product Manual Rev04
71
8.2.32 Sleep (E6h)
This command is the only way to cause the drive to enter Sleep Mode. The drive is spun down, and when it is
stopped, BSY is cleared, an interrupt is generated, and the interface becomes inactive.
The only way to recover from Sleep mode without a reset or power-on is for the host to issue a software reset.
A drive shall not power-on in Sleep Mode nor remain in Sleep Mode following a reset sequence. If the drive
is already spun down, the spin down sequence is not executed.
8.2.33 Standby (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.
8.2.34 SMART (B0h)
Individual SMART commands are identified by the value placed in the Feature resister. Below depicts these
Feature register values.
Table 8-14 SMART Feature Registers Values
Feature Value Command
D0h SMART READ DATA
D1h Obsolete (SMART Read Threshold)
D2h SMART ENABLE/DISABLE ATTRIBUTE AUTOSAVE
D3h Obsolete (SMART Save Attribute Value)
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 Obsolete (Enable/Disable Auto Offline Scan)
DCh-DDh Reserved
DEh Reserved (Initialize SMART Variables)
DFh Reserved