Technical information

HGST Ultrastar C15K600 Hard Disk Drive Specification

Figure 4 Power vs IOPS

9.2

Ripple Voltage

Table 23 Power Supply Generated Ripple at Drive Power Connector

Maximum (mV pp)

MHz

+5 V DC 250 0-10

+12 V DC 250 0-10

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.

To prevent external electrical noise from interfering with the drive's performance, the drive must be held by four

screws in a user system frame that has no electrical level difference at the four screw positions. The drive

enclosure must not be used in the current return path of the drive power supply. The maximum common-mode

noise current passing through the drive must not exceed 20 mA.