Seagate ST9500323CS ユーザーズマニュアル
Pipeline HD Mini Series SATA Product Manual, Rev. E 9
2.9.2
Conducted noise
Input noise ripple is measured at the host system power supply across an equivalent 15-ohm resistive load on the
+5 volt line.
+5 volt line.
Using 5-volt power, the drive is expected to operate with a maximum of 100 mV peak-to-peak square-wave
injected noise at up to 10 MHz.
injected noise at up to 10 MHz.
Note.
Equivalent resistance is calculated by dividing the nominal voltage by the typical RMS read/write cur-
rent.
rent.
2.9.3
Voltage tolerance
Voltage tolerance (including noise):
5V
± 5%
2.9.4
Power-management modes
The drive provides programmable power management to provide greater energy efficiency. In most systems, you
can control power management through the system setup program. The drive features the following power-man-
agement modes:
can control power management through the system setup program. The drive features the following power-man-
agement modes:
• Active mode
The drive is in Active mode during the read/write and seek operations.
• Idle mode
The buffer remains enabled, and the drive accepts all commands and returns to Active mode any time disc access
is necessary.
is necessary.
• Standby mode
The drive enters Standby mode when the host sends a Standby Immediate command. If the host has set the
standby timer, the drive can also enter Standby mode automatically after the drive has been inactive for a
specifiable length of time. The standby timer delay is established using a Standby or Idle command. In Standby
mode, the
standby timer, the drive can also enter Standby mode automatically after the drive has been inactive for a
specifiable length of time. The standby timer delay is established using a Standby or Idle command. In Standby
mode, the
drive buffer is in Self Refresh Low Power mode, the heads are parked and the spindle is at rest. The
drive accepts all commands and returns to Active mode any time disc access is necessary.
• Sleep mode
The drive enters Sleep mode after receiving a Sleep command from the host.
In Sleep mode, the drive buffer is
in Self Refresh Low Power mode, the heads are parked and the spindle is at rest. The drive leaves Sleep mode
after it receives a Hard Reset or Soft Reset from the host. After receiving a reset, the drive exits Sleep mode and
enters Standby mode with all current translation parameters intact.
after it receives a Hard Reset or Soft Reset from the host. After receiving a reset, the drive exits Sleep mode and
enters Standby mode with all current translation parameters intact.
Table 4:
Power management modes
Power modes
Heads
Spindle
Buffer
Active (operating)
Tracking
Rotating
Full power
Idle, performance
Tracking
Rotating
Self refresh—low power
Idle, active
Floating
Rotating
Self refresh—low power
Idle, low power
Parked
Rotating
Self refresh—low power
Standby
Parked
Stopped
Self refresh—low power
Sleep
Parked
Stopped
Self refresh—low power