Seagate ST19171WC Product Manual - Page 31
Physical/electrical specifications
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Barracuda 9 Product Manual, Rev. C 21 6.0 Physical/electrical specifications This section provides information relating to the physical and electrical characteristics of Barracuda 9 drives. 6.1 None. AC power requirements 6.2 DC power requirements The voltage and current requirements for a single drive are shown in the following table. Values indicated apply at the drive's power connector. The power requirements for single-ended models includes the internal disc drive SCSI I/O termination. Current values are in Amperes. Table 2: DC power requirements Notes ST19171N/W/WC ST19171WD/DC Single-ended Differential Voltage Regulation Maximum operating current DC3σ Average idle current DCX Maximum starting current (peak DC) DC3σ (peak AC) AC3σ Delayed motor start (max) DC3σ Peak operating current Typical DCX Maximum DC3σ Maximum (Peak) DC3σ Track following at OD DCX ID DCX Read Track OD DC3σ AC3σ Seeking (Typical) DCX Maximum DC3σ Maximum (Peak) AC3σ [5] [1] [1] [9] [3] [6] [3] [1] [4] [1] [7] [1] [1] [1] [1] [11] [1] [10] [1] +5 V [8] +12 V ±5% ±5% [2] 0.93 0.89 0.84 0.73 0.92 2.18 3.1 0.82 0.08 0.92 0.84 0.93 0.89 1.00 1.8 0.84 0.73 0.83 0.76 0.96 0.78 1.10 0.97 0.91 1.06 0.92 1.1 0.96 1.8 +5 V [8] +12 V ±5% ±5%[2] 1.17 0.89 0.96 0.73 1.04 2.18 3.1 0.90 0.08 1.12 0.84 1.17 0.89 1.89 1.8 0.96 0.73 0.94 0.76 1.49 0.78 1.99 0.97 0.99 1.06 1.05 1.1 1.77 1.8 [1] Measured with average reading DC ammeter. Instantaneous +12V current peaks will exceed these values. [2] A -10% droop is permissible during initial start of spindle, and must return to ±5% before 7,200 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 +12V current profile in Figure 3. [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] At power-up, the motor current regulator limits the 12 volt current to an average value of less than 2.5 amperes, although instantaneous peaks may exceed this value. These peaks should measure 5 msec duration or less. [7] Operating condition is defined as a third-stroke seek at OD and Read One track. A command is issued every 0.062 seconds. [8] No terminator power. See Section 9.9.