Seagate ST9146753SS, ST9300653SS, ST9300553SS, ST9300453SS manual 146GB models DC power requirements

Table 3:	146GB models DC power requirements
				3.0 Gb mode		6.0 Gb mode
Parameter			Notes	(Amps)	(Amps)	(Amps)	(Amps)
Voltage				+5V	+12V [2]	+5V	+12V [2]
Regulation			[5]	±5%	±5% [2]	±5%	±5% [2]
Avg idle current DC			[1] [7]	0.36	0.17	0.36	0.17
Standby		3σ		0.28	0.05	0.27	0.04
Maximum starting current
(peak DC) DC		3σ	[3]	0.67	0.86	0.67	0.86
(peak AC) AC		3σ	[3]	0.91	1.74	1.01	1.60
Delayed motor start (max) DC		3σ	[1] [4]	0.56	0.06	0.56	0.06
Peak operating current: (random read)
Typical DC			[1] [6]	0.50	0.41	0.48	0.42
Maximum DC		3σ	[1]	0.52	0.42	0.50	0.43
Maximum (peak) DC		3σ		1.37	1.25	1.29	1.24
Peak operating current: (random write)
Typical DC			[1]	0.59	0.32	0.57	0.33
Maximum DC		3σ	[1]	0.61	0.34	0.58	0.34
Maximum (peak) DC		3σ		1.20	1.27	1.12	1.25
Peak operating current: (sequential read)
Typical DC			[1]	0.87	0.18	0.84	0.19
Maximum DC		3σ	[1]	0.93	0.18	0.90	0.19
Maximum (peak) DC		3σ		1.22	0.43	1.21	0.41
Peak operating current: (sequential write)
Typical DC			[1]	1.00	0.18	0.98	0.19
Maximum DC		3σ	[1]	1.06	0.18	1.03	0.19
Maximum (peak) DC		3σ		1.32	0.36	1.34	0.36

[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 15K 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 1.

[4]This condition occurs after OOB and Speed Negotiation completes but before the drive has received the Notify Spinup primitive.

[5]See paragraph 7.3.1, "Conducted noise immunity." Specified voltage tolerance includes ripple, noise, and transient response.

[6]Operating condition is defined as random 8 block reads.

[7]During idle, the drive heads are relocated every 60 seconds to a random location within the band from three-quarters to maximum track.

Savvio 15K.3 SAS Product Manual, Rev. A 25