Seagate ST3146707LW/LC, ST3300007LW/LC, ST373207LW/LC manual ST3146707 SE mode LVD mode

												ST3146707
								Notes		SE mode				LVD mode
Voltage									+5 V			+12 V	+5 V		+12 V
Regulation								[5]	±5%		±5%[2]		±5%		±5%[2]
Average idle current DC								[1][7]	0.54		0.42		0.54		0.42
			X
Maximum starting current
(peak DC) DC	3σ							[3]	0.77		1.89		0.76		1.89
(peak AC) AC	3σ							[3]	1.09		3.66		1.06		3.83
Delayed motor start (max) DC						3σ		[1][4]	0.54		0.06		0.54		0.06
Peak operating current
DC		X						[1][6]	0.60		0.81		0.61		0.83
Maximum DC	3σ							[1]	0.62		0.83		0.63		0.85
Maximum (peak) DC	3σ								1.52		2.50		1.44		2.48
												ST373207
								Notes		SE mode				LVD mode
Voltage									+5 V			+12 V	+5 V		+12 V
Regulation								[5]	±5%			±5%[2]	±5%		±5%[2]
Average idle current DC								[1][7]	0.54			0.34	0.54		0.34
						X
Maximum starting current
(peak DC) DC				3σ				[3]	0.76			1.55	0.77		1.56
(peak AC) AC					3σ			[3]	1.08			3.04	1.03		3.36
Delayed motor start (max) DC						3σ		[1][4]	0.54			0.06	0.54		0.06
Peak operating current
DC							X	[1][6]	0.62			0.73	0.60		0.72
Maximum DC						3σ		[1]	0.63			0.76	0.61		0.74
Maximum (peak) DC						3σ			1.56			2.46	1.48		2.40

[1]Measured with average reading DC ammeter or equivalent sampling scope. Instantaneous current peaks will exceed these values. Power supply at nominal voltage. Number of drives tested = 6, 35 Degrees C ambient.

[2]For +12 V, a –10% tolerance is permissible during initial start of spindle, and must return to ±5% before 10,000 rpm is reached. 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 +12 V current profile in Figure 2.

[4]This condition occurs when the Motor Start Option is enabled and the drive has not yet received a Start Motor command.

[5]See Section 6.2.1 “Conducted Noise Immunity.” Specified voltage tolerance is inclusive of ripple, noise, and transient response.

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

257 I/Os per second (ST3300007) LVD

257 I/Os per second (ST3146707) LVD

256 I/Os per second (ST373207) LVD

Current and power specified at nominal voltages. Decreasing +5 volts by 5% increases 5 volt current by <0.5%. Decreasing +12 volt supply by 5% increases 12 volt current by 1.4% (2% for ST3146707 and ST373207 models).

[7]During idle, the drive heads are relocated every 60 seconds to a random location within the band from

26 Cheetah 10K.7 SCSI Product Manual, Rev. D