Table 14 Input Voltage; Figure 7 Start Up Current Waveforms; Dc Power Requirements - Western Digital Ultrastar DC HC310 Specifications

6.3

DC Power Requirements

Connections to the drive should be made in a Safety Extra Low Voltage (SELV) circuit that can provide sufficient 5V
and 12V current, as described in this section.
The following voltage specifications apply at the drive power connector.
There are no power on or off voltage sequencing requirements.
The drive provides resettable over-current protection on both 5V and 12V. Over-current protection will reset during a
power cycle.
Hot-plug or unplug is supported for all models, with the following exception:
SATA cabled connection using separated (two part) power and signal cables
Initial capacitance is the amount of capacitance to charge during the initial hot-plug event.
Dependent on the selected SATA model the drive will support SATA 3.3 Power Disable Feature Support. (Refer to
section 1.1)
Table values for current and power are considered 'typical' values. Typical is defined as observed average or
observed maximum in a sample of 10 drives per model under voltage conditions of 5.0 and 12.0V at the drive
reported temperatures as noted.
6.3.1 Input Voltage
Input Voltage
+5 Volts Supply
+12 Volts Supply

Table 14 Input Voltage

Caution: To avoid damage to the drive electronics, power supply voltage spikes must not exceed specifications.
1
During start up and operation
Start up peak AC and DC on 5V and 12V

Figure 7 Start up current waveforms

Voltage Absolute Max
1
Tolerance Spike Voltage
–0.3 to 5.5V
5V ± 5%
–0.3 to 15.0V
12V ± 5%
Western Digital Hard Disk Drive OEM Specification
Supply Voltage Rise
Time
0 to 200ms
0 to 400ms
19
Initial Capacitance
10uF
1uF