Barracuda 18XL Product Manual, Rev. A
23
6.2.3
Current profile
Figures 3a and 3b identify the drive +5 V and +12 V current profile. The current during the various times is as
shown:
Note.
All times and currents are typical. See Table 2 for maximum current requirements.
Figure 3a.
Typical Barracuda 18XL family drive +12 V current profile
T -
Power is applied to the drive.
T1 -
Controller self tests are performed.
T2 -
Spindle begins to accelerate under current limiting after performing drive internal
diagnostics. See Note 1 of Table 2.
T3 -
The heads move from the landing zone to the data area.
T4 -
The adaptive servo calibration sequence is performed.
T5 -
Calibration is complete and the drive is ready for reading and writing.
0.0
2
4
6
8
10
12
14
16
18
20
0.0
0.5
1.0
1.5
2.0
2.5
3.0
A
Seconds
T1
T3
AC Envelope
T2
Nominal (average)
DC curve
+12 Volt Current during spindle start – Typical Amperes
T
T4
T5
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