Seagate BARRACUDA 2LP, Product Manual

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Barracuda 2LP 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.
0 5 10 15
0.0
0.5
1.0
1.5
Peak AC
Nominal (average) curve
T0 T1 T2 T3 T4 T5 T6
Minimum AC
TIME (S)
ST31250
ST32550
+12V CURRENT (A)
0 5 10 15 20 25 30
0.0
0.5
1.0
1.5
2.0
2.5
3.0
2.85
Peak AC
Nominal (average) curve
T0
T1
T2
T3
T4
T5
Minimum AC
TIME (S)
+12V CURRENT (A)
T6
1.9
Figure 14. Barracuda 2LP drives typical
+++++
12V current profiles
T0 Power is applied to the drive.
T1 Controller self-tests are performed.
T2 The spindle begins to accelerate under current limiting after performing
internal diagnostics. See Section 7.2, note 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 Calibration is complete and the drive is ready for reading and writing.
Note. All times and currents are typical. See Section 7.2 for maximum
current requirements.