Conducted Noise; Voltage Tolerance; Power-Management Modes - Seagate ST4000DM000 Product Manual

Drive Specifications
During Standby mode, the drive accepts commands, but the drive is not spinning, and the servo and read/
write electronics are in power-down mode.
Table 2 DC power requirements (3TB and 4TB)
Power dissipation (4-disk values shown)
Spinup
Idle* †
Operating
Standby
Sleep
*During periods of drive idle, some offline activity may occur according to the S.M.A.R.T. specification, which may increase acoustic and power
to operational levels.
†5W IDLE with DIPLM Enabled

2.8.2 Conducted noise

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

2.8.3 Voltage tolerance

Voltage tolerance (including noise):
• 5V
±5%
• 12V
±10%

2.8.4 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-
management modes:
Power modes
Active
Idle
Standby
Sleep
• Active mode
The drive is in Active mode during the read/write and seek operations.
16
Avg (watts 25° C)
—
5.0
7.50
0.750
0.750
Heads
Tracking
Tracking
Parked
Parked
Avg 5V typ amps
—
0.17
0.48
0.138
0.138
Spindle
Rotating
Rotating
Stopped
Stopped
Desktop HDD SATA Product Manual, Rev. C
www.seagate.com
Avg 12V typ amps
2.0
0.35
0.43
0.005
0.005
Buffer
Enabled
Enabled
Enabled
Disabled