Seagate ST19171W - Barracuda 9.1 GB Hard Drive Product Manual page 34

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these temperatures. See Section 8.3.1. Continual or sustained operation at case temperatures above these
values may degrade MTBF.
To confirm that the required cooling for the Barracuda electronics and HDA is provided, place the drive in its
final mechanical configuration, perform operations that represent typical drive usage and, after the temper-
atures stabilize, measure the case temperature of the components listed in Table 3 (see notes [2] and [3]).
To obtain the maximum temperature for each of the reference components listed (Column 1), 36°F (20°C)
was added to the temperatures of Column 2. The maximum HDA case temperature is 140°F (60°C).Opera-
tion of the drive at the maximum case temperature is intended for short time periods only. Continuous oper-
ation at the elevated temperatures will reduce product reliability.
Table 3: PCB and HDA temperatures
Component
OP Amp
SCSI Controller
Servo DSP
Servo/SCSI/RW
Motor Controller
HDA housing [3]
Notes.
[1] Section 8.3.1 describes the air-flow patterns used when generating the 1 million hours MTBF guide-
lines in column 2. Air flow was opposite that shown in Section 8.3.1. Local air velocity was 0.61 msec
(120 lfpm). Inlet air temperature to the drive was 77°F (25°C), plus 9°F (5°C) temperature rise in the
test enclosure (86°F/30°C ambient local to the drive).
[2] The temperatures in Column 1 are calculated and may not reflect actual operating values. Sufficient
cooling air may be required to ensure that these values are not exceeded.
[3] Measure HDA temperature at point labeled "HDA Temp. Checkpoint" on Figures 4a and 4b.
[4] PCB mounted integrated circuit case.
Figure 4a Figure 4b
reference reference
1 1
2 2
3
3
4 4
Barracuda 9 Product Manual, Rev. C
Column 1
Maximum case [4]
temperature (°C) operating
(50°C drive ambient) [2]
149°F (66°C)
182°F (83°C)
155°F (68°C)
178°F (81°C)
178°F (81°C)
140°F (60°C)
Column 2
Maximum allowable
case [4] temperature (°C)
to meet MTBF spec. [1]
114°F (46°C)
146°F (63°C)
119°F (48°C)
142°F (61°C)
142°F (61°C)
113°F (45°C)