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Figure 4.8 shows the max seek current waveform of +5V DC and +12V DC.
MBA3300NC
MBA3300NP
MBA3147NC
MBA3147NP
MBA3073NC
MBA3073NP
Current (500mA/div)
Time (10 msec/div)
Current (500mA/div)
Time (10 msec/div)
Current (500mA/div)
Time (10 msec/div)
+5VDC
MBA3300NC
MBA3300NP
MBA3147NC
MBA3147NP
MBA3073NC
MBA3073NP
Current (500mA/div)
Time (10 msec/div)
Current (500mA/div)
Time (10 msec/div)
Current (500mA/div)
Time (10 msec/div)
+12VDC
Figure 4.8 Current waveform (Max seek)
(3) Power on/off sequence
a) The order of the power on/off sequence of +5V DC and +12V DC, supplied to the HDD, does
not matter.
b) In a system which uses the terminating resistor power supply signal (TERMPWR) on the
SCSI bus, the requirements for +5V DC given in Figure 4.9 must be satisfied between the
HDD and at least one of the SCSI devices supplying power to that signal.
Figure 4.9 Power on/off sequence (1)
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