Seagate Pulsar XT.2 Manual download pdf (Page 33)

Pulsar XT.2 SAS Product Manual, Rev. B 25

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

supply at nominal voltage. N (number of drives tested) = 6, 60 Degrees C ambient.

[2] For +12 V, a –10% tolerance is allowed during initial start but must return to ±5% before reaching ready state. 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 4 (for 400GB models) and Figure 5 (for 200GB models).

[4] See +12V current profile in Figure 6 (for 100GB models).

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

primitive.

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

response.

Table 10: 100GB standard model DC power requirements

Parameter 100GB (6.0Gb)

Regulation ±5% ±5%

Voltage +5V +12V

Current (A) Current (A) Power (W)

Average idle current

DC

0.40 0.17 4.04

Maximum starting current

(peak DC) DC 3σ 1.09 0.31

(peak AC) AC 3σ 1.16 0.73

Delayed start (max) DC 3σ 0.43 0.18 4.31

Peak operating current (random read):

Typical DC DC 0.46 0.21 4.82

Maximum DC 3σ 0.49 0.23 5.21

Maximum (peak) DC 3σ 0.80 0.72

Peak operating current (random write)

Typical DC DC 0.45 0.25 5.25

Maximum DC 3σ 0.49 0.26 5.57

Maximum (peak) DC 3σ 0.71 0.54

Peak operating current (sequential read)

Typical DC DC 0.54 0.28 6.06

Maximum DC 3σ 0.58 0.29 6.38

Maximum (peak) DC 3σ 0.80 0.58

Peak operating current (sequential write)

Typical DC DC 0.53 0.36 6.97

Maximum DC 3σ 0.57 0.37 7.29

Maximum (peak) DC 3σ 0.82 0.82

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Seagate Pulsar XT.2 Manual Page 33