Seagate ST31200N, Руководство по эксплуатации продукта

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16
T6
20
0 2 4 6 8 10
Seconds
12 14 16 18
1
2
3
5V
Current
(amps)
CHANNEL 1 GND
4
T
20
T1 T2
T4 T3
T5
0 2 4 6 8 10 12 14 18
1
2
3
12V
Current
(amps)
CHANNEL 2 GND
4
Product Manual - Hawk 1LP Family SCSI-2 (Volume 1), Rev. A 21
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7.2.2 Power sequencing
The drive does not require power sequencing. The drive protects against inadvertent writing during power up
and down. Daisy-chain operation requires that power be maintained on the terminated drive to ensure proper
termination of the peripheral I/O cables.
7.2.3 12 V - current profile
Figure 7.2.2-1 identifies the drive +5 V and +12 V current profile. The current during the various times is as
shown:
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 7.2-1.
T3 -The spindle is up to speed and the Head-Arm restraint is unlocked.
T4 -The 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 7.2-1 for maximum current
requirements.
Figure 7.2.2-1. Typical Hawk 1LP family drive +5 V and +12 V current profile