HGST Ultrastar 7K4000 (SAS) Hard Disk Drive Specification
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9.2 Ripple Voltage
Table 15: Power Supply Generated Ripple at Drive Power Connector
During drive start up and seek, 12 volt ripple is generated by the drive (referred to as dynamic loading). If the power of several
drives is daisy chained, the power supply ripple plus other drive dynamic loading must remain within the regulation tolerance
of +5%. A common supply with separate power leads to each drive is a more desirable method of power distribution.
Maximum (mV pp) MHz
+5 V DC 250 0-10
+12 V DC 250 0-10
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