Seagate ST31000640SSIM manual ST3750630SS DC power requirements, ST3500620SS DC power requirements

Table 3:	ST3750630SS DC power requirements
				ST3750630SS
				3 Gbit mode
			Notes	(Amps)	(Amps)
Voltage				+5V	+12V [2]
Regulation			[5]	±5%	±5% [2]
			[1] [6]	0.60	0.50
Avg idle current DCX
Maximum starting current
(peak DC) DC		3σ	[3]	0.90	2.00
(peak AC) AC		3σ	[3]	1.10	3.50
		3σ
Delayed motor start (max) DC			[1] [4]	0.60	0.17
Peak operating current:
			[1]	0.62	0.78
Typical DCX
Maximum DC		3σ	[1]	0.74	0.82
Maximum (peak) DC		3σ		1.15	1.75
Table 4:	ST3500620SS DC power requirements
				3 Gbit mode
			Notes	(Amps)	(Amps)
Voltage				+5V	+12V [2]
Regulation			[5]	±5%	±5% [2]
			[1] [6]	0.60	0.50
Avg idle current DCX
Maximum starting current
(peak DC) DC		3σ	[3]	0.90	2.00
(peak AC) AC		3σ	[3]	1.10	3.50
		3σ
Delayed motor start (max) DC			[1] [4]	0.60	0.17
Peak operating current:
			[1]	0.62	0.78
Typical DCX
Maximum DC		3σ	[1]	0.74	0.82
Maximum (peak) DC		3σ		1.15	1.75

[1]Measured with average reading DC ammeter or equivalent sampling scope. Instantaneous +12V current peaks will exceed these values. 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 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.

[3]See +12V current profile in Figure 2.

24 Barracuda ES.2 SAS Product Manual, Rev. G