Table 18 Allowable Power Supply Noise Limits At Drive Power Connector; Table 19 Power Consumption Efficiency - Western Digital Ultrastar DC HC310 Specifications

6.3.3 Power Line Noise Limits
+5V DC
+12V DC

Table 18 Allowable Power Supply Noise Limits at Drive Power Connector

During drive operation, both 5 and 12-volt ripple are generated by the drive due to dynamic loading of the power
supply. This voltage ripple will add to existing power supply voltage ripple. The sum is the power line noise.
To prevent significant performance loss, the power line noise level when measured at the drive power connector
should be kept below the limits in the above table.
6.3.4 Power Consumption Efficiency
Power Consumption
Efficiency at Idle_0
6TB
4TB

Table 19 Power Consumption Efficiency

Noise Voltage (mV pp)
250
800
450
250
SATA W/GB
0.00102
0.00128
Western Digital Hard Disk Drive OEM Specification
Frequency Range
100Hz-20MHz
100Hz-8KHz
8KHz-100KHz
100KHz-20MHz
24