Seagate ST9500432SS, ST9500430SS, ST9500431SS manual

Table 2:	500GB drive (Standard & SED model) DC power requirements
				3.0 Gbit mode		6.0 Gbit mode
			Notes	(Amps)	(Amps)	(Amps)	(Amps)
Voltage				+5V	+12V [4]	+5V	+12V [4]
Regulation			[5]	±5%	±5% [2]	±5%	±5% [2]
			[1] [7]	0.33	0.10	0.34	0.10
Avg idle current DCX
Advanced idle current
	Idle_A			0.32	0.10	0.34	0.10
	Idle_B			0.23	0.08	0.24	0.08
	Idle_C/ Standby_Y			0.23	0.05	0.24	0.05
	Standby_Z			0.23	0.02	0.25	0.02
Maximum starting current
	(peak DC) DC	3σ	[5]	0.59	0.65	0.60	0.65
	(peak AC) AC	3σ	[5]	0.90	0.87	0.97	1.03
		3σ
Delayed motor start (max) DC			[1] [6]	0.55	0.03	0.58	0.03
Peak operating current (random read):
			[1] [6]	0.41	0.14	0.43	0.14
	Typical DCX
	Maximum DC	3σ	[1]	0.44	0.15	0.46	0.14
	Maximum (peak) DC	3σ		0.98	0.54	1.04	0.54
Peak operating current (random write)
				0.46	0.14	0.47	0.14
	Typical DCX
	Maximum DC	3σ		0.49	0.14	0.50	0.14
	Maximum (peak) DC	3σ		1.22	0.56	1.22	0.56
Peak operating current (sequential read)
				0.73	0.12	0.75	0.12
	Typical DCX
	Maximum DC	3σ		0.77	0.12	0.80	0.12
	Maximum (peak) DC	3σ		1.04	0.20	1.12	0.20
Peak operating current (sequential write)
				0.79	0.12	0.80	0.12
	Typical DCX
	Maximum DC	3σ		0.84	0.12	0.85	0.12
	Maximum (peak) DC	3σ		1.20	0.20	1.22	0.20

[1]Measured with average reading DC ammeter.

[2]Instantaneous +12V current peaks will exceed these values.

[3]Power supply at nominal voltage. N (number of drives tested) = 6, 35 Degrees C ambient.

[4]For +12 V, a –10% tolerance is allowed during initial spindle start but must return to ±5% before reaching 7,200 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.

Constellation SAS Product Manual, Rev. E 23