Seagate ST9600204FC, ST300MM0026 manual DC power requirements for ST9450404FC model 2Gb 4Gb Amps

Table 3:	DC power requirements for ST9450404FC model
				2Gb		4Gb
			Notes	(Amps)	(Amps)	(Amps)	(Amps)
Voltage				+5V	+12V [2]	+5V	+12V [2]
Regulation			[6]	±5%	±5% [2]	±5%	±5% [2]
Avg idle current DC			[1] [8]	0.35	0.25	0.38	0.25
Advanced Idle Current
	Idle_A	3σ		0.35	0.25	0.37	0.25
	Idle_B	3σ		0.25	0.22	0.27	0.22
	Idle_C	3σ		0.24	0.10	0.27	0.10
	Standby	3σ		0.24	0.06	0.27	0.06
Transition Current
	Idle_A - Active	3σ		0.76	1.54	0.78	1.54
	Idle_B - Active	3σ		0.64	1.58	0.64	1.54
	Idle_C - Active	3σ		0.62	1.56	0.66	1.56
	Standby - Active	3σ		0.66	1.64	0.68	1.64
Maximum starting current
	(peak DC) DC	3σ	[4]	0.54	0.89	0.56	0.89
	(peak AC) AC	3σ	[4]	0.86	1.64	0.88	1.64
Delayed motor start (max) DC		3σ	[1] [5]	0.49	0.06	0.51	0.06
Peak operating current (random read):
	Typical DC		[1] [7]	0.42	0.46	0.45	0.46
	Maximum DC	3σ	[1]	0.43	0.48	0.47	0.47
	Maximum (peak) DC	3σ		1.06	1.54	1.10	1.54
Peak operatig current (random write)
	Typical DC			0.47	0.39	0.49	0.40
	Maximum DC	3σ		0.49	0.41	0.51	0.42
	Maximum (peak) DC	3σ		1.02	1.58	1.02	1.56
Peak operating current (sequential read)
	Typical DC			0.83	0.24	0.86	0.24
	Maximum DC	3σ		0.85	0.25	0.89	0.25
	Maximum (peak) DC	3σ		1.12	0.40	1.14	0.40
Peak operating current (sequential write)
	Typical DC			0.82	0.24	0.85	0.24
	Maximum DC	3σ		0.83	0.25	0.87	0.25
	Maximum (peak) DC	3σ		1.04	0.46	1.06	0.44

[1]Measured with average reading DC ammeter. Instantaneous +12V current peaks will exceed these val- ues. Power supply at nominal voltage. N (number of drives tested) = 6, 35 Degrees C ambient.

[2]For +12 V, a –10% tolerance is allowed during initial spindle start but must return to ±5% before reaching 9,936 RPM. The ±5% must be maintained after the drive signifies that its power-up sequence has been completed and that the drive is able to accept selection by the host initiator.

[3]See +12V current profile in Figure 3.

Savvio 10K.4 FC Product Manual, Rev. A 23