Seagate ST19171WC Product Manual - Page 34
Barracuda 9 Product Manual, Rev. C, Notes. - specs
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24 Barracuda 9 Product Manual, Rev. C 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 temperatures 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).Operation of the drive at the maximum case temperature is intended for short time periods only. Continuous operation 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] Figure 4a reference 1 2 3 4 Figure 4b reference 1 2 3 4 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) Notes. [1] Section 8.3.1 describes the air-flow patterns used when generating the 1 million hours MTBF guidelines 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.