Conducted Noise; Voltage Tolerance; Power-Management Modes - Seagate ST2000NX0243 Product Manual

2.5.2

Conducted noise

Noise is specified as a periodic and random distribution of frequencies covering a defined frequency range. Maximum
allowed noise values given below are peak-to-peak measurements and apply at the drive power connector.
+5v = 250 mV pp from 100 Hz to 20 MHz.
+12v = 450 mV pp from 100 Hz to 100 KHz.
250 mV pp from 100 KHz to 20 MHz.
150 mV pp from 20 MHz to 80 MHz.
2.5.3

Voltage tolerance

Voltage tolerance (including noise):
5V ± 5% 12V ± 5%
2.5.4

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 count-
ing 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.
Seagate Enterprise Capacity 2.5 HDD v3 SATA Product Manual, Rev. D
Spindle
Rotating
Rotating
Rotating
Rotating at lower RPM
Stopped
Stopped
Buffer
Enabled
Enabled
Enabled
Enabled
Enabled
Disabled
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