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DISK DRIVE OPERATION
SpinPoint V40 Product Manual
81
6.5.3 Power Conditions
SpinPoint drives reduce the power required to operate (see Table 6-14), which describes each operating mode
and the status of the major components.
Table 6-14 Power Saving Mode
MODE R/W Spindle VCM Servo Interface CPU ADC Pre Amp
SLEEP OFF OFF OFF OFF Disk OFF
Host OFF
OFF OFF OFF
STANDBY OFF OFF OFF OFF Disk OFF
Host OFF
ON OFF OFF
IDLE OFF
Partially
(Time base
generator)
ON ON ON Disk OFF
Host OFF
ON ON ON
NORMAL ON ON ON ON ON ON ON ON
6.5.3.1 Sleep mode
When a Sleep command is received, the drive enters Sleep mode.
The lowest power consumption occurs in Sleep mode. When in Sleep mode, the drive requires a reset to be
activated (see 6.4.22).
6.5.3.2 Standby mode
When a Standby command is received, or an Auto-Power Down sequence is enabled and the Auto-Power
Down Count is zero, then the drive enters Standby mode.
In Stand-By mode, the drive interface is capable of accepting commands, but the media is not immediately
accessible.
6.5.3.3 Idle mode
When an Idle command is received, or an Auto-Power Down sequence is enabled and the Auto-Power Down
Count is zero, then the drive enters Idle mode immediately.
After the drive enters Idle Mode, it automatically transitions to Standby Mode upon expiration of a
prescribed 1 minute spin-down counter.
In Idle mode, the drive is capable of responding immediately to media access requests. A drive in Idle mode
may take longer to complete the execution of a command than in Normal mode, because it may have to
activate ENDEC and R/W circuit.