+ + + + + 12V Current Profile; Heat/Power Dissipation; Figure 8. Elite 9 Drive Typical +12V Current Profile - Seagate Elite 9 Product Manual

28
7.2.3
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0
t0 t1
7.3

+ + + + + 12V current profile

Figure 8 identifies the drive's +12V current profile. The current during the
various times is as shown.
Peak AC
Nominal Curve (average)
Minimum AC
5 10
t2
Time (seconds)
Figure 8. Elite 9 drive typical + + + + + 12V current profile
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.
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 Table 1 for maximum current
requirements.

Heat/power dissipation

The heat and DC power dissipation values for your drive are listed below.
Typical seek and read
avg at nominal voltages
Typical under idle
conditions
Elite 9 Product Manual, Rev. C
4.8
4.4
3.4
15 20
t5
t3 t4
ST410800N/W ST410800ND ST410800WD
25W 26W
(85 BTUs/hr) (89 BTUs/hr)
22W 22W
(75 BTUs/hr) (75 BTUs/hr)
25 30
t6
26W
(89 BTUs/hr)
23W
(78 BTUs/hr)