Seagate ST15150N Product Manual - Page 45
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ST15150N/ND/W/WD/WC/DC Product Manual, Rev. D 35 7.2.3 12V current profile Figure 14 identifies the drive's +12V current profile. The current during the various times is as shown. 3.0 2.85 2.5 Peak AC Nominal (average) curve 2.0 1.9 1.5 +12V CURRENT (A) Minimum AC 1.0 0.5 T0 T1 0.0 0 T2 5 T3 10 T5 T4 15 TIME (S) T6 T7 20 25 30 Figure 14. Typical Barracuda 4 drive +12V current profile T0 Power is applied to the drive. T1 Controller self-tests are performed. T2 Spindle begins to accelerate under current limiting after performing internal diagnostics. See Note 1 of Table 1. T3 The spindle is up to speed and the head-arm restraint is unlocked. T4 Heads move from the landing zone to the data area. T5 The adaptive calibration sequence is performed. T6 Thermal calibration. T7 Calibration is complete and the drive is ready for reading and writing. Note. All times and currents are typical. See Table 1 for maximum current requirements.