Conducted Noise; Voltage Tolerance; Power-Management Modes - Seagate Constellation ES.3 ST4000NM0033 Product Manual

2.6.2

Conducted noise

Input noise ripple is measured at the host system power supply across an equivalent 80-ohm resistive load on the +12 V line or an
equivalent 15-ohm resistive load on the +5V line.
• Using 12V power, the drive is expected to operate with a maximum of 120mV peak-to-peak square-wave injected noise at up to
10MHz.
• Using 5V power, the drive is expected to operate with a maximum of 100mV peak-to-peak square-wave injected noise at up to
10MHz.
Equivalent resistance is calculated by dividing the nominal voltage by the typical RMS read/write current.
Note
2.6.3

Voltage tolerance

Voltage tolerance (including noise):
5V ± 5%
12V ± 5%
2.6.4

Power-management modes

The drive provides programmable power management to provide greater energy efficiency. In most systems, the user can control
power management through the system setup program. The drive features the following power-management modes:
Power modes Heads
Active Tracking
Idle_a ID Biased
Idle_b Parked
Idle_c Parked
Standby Parked
Sleep Parked
• 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 disk 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 enabled, the heads are parked
and the spindle is at rest. The drive accepts all commands and returns to Active mode any time disk 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 disabled, 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.
• Idle and Standby timers
Each time the drive performs an Active function (read, write or seek), the standby timer is reinitialized and begins counting down
from its specified delay times to zero. If the standby timer reaches zero before any drive activity is required, the drive makes a
transition to Standby mode. In both Idle and Standby mode, the drive accepts all commands and returns to Active mode when
disk access is necessary.
Constellation ES.3 Serial ATA Product Manual, Rev. F
Spindle
Rotating
Rotating
Rotating
Rotating at lower RPM
Stopped
Stopped
Buffer
Enabled
Enabled
Enabled
Enabled
Enabled
Disabled
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