Seagate ST9120821AS - Momentus 5400.2 120 GB Hard Drive, Руководство по эксплуатации продукта

Страница: 15 / 40

Momentus 5400.2 SATA Removable Drive Cartridge Product Manual, Rev. C 9
2.9.3 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.
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.
Note. Equivalent resistance is calculated by dividing the nominal voltage by the typical RMS read/write
current.
2.9.4 Voltage tolerance
Voltage tolerance (including noise):
5V
±
5%
2.9.5 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-management 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.
• 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
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.
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