4.2. Reliability
The FFD provides a very high number of hours for Mean Time Between Failures (MTBF). Exact
times are capacity dependent, as described in Table 12.
Table 12: Mean Time Between Failures (MTBF) per Capacity
Capacity (GB)
Mean Time Between Failures (Hours)
2, 4, 8
692,530
16, 32
468,648
64 313,499
112, 224
202,610
160, 320
149,669
176, 352
135,662
Performance assessments are based on Telcordia SR-332, GB, 25°C. A detailed MTBF report
can be provided upon customer request.
4.3. Embedded Error Detection and Error Correction Code
(EDC/ECC)
The FFD has embedded error detection and error correction hardware and software mechanisms.
The EDC/ECC uses the BCH algorithm, which can detect up to 5 errors in 512 bytes of data, and
correct up to 4 errors.
4.4. Environmental
Conditions
The FFD complies with the performance requirements specified herein after exposure to
non-operating environmental conditions, or during and after exposure to operating environmental
conditions.
4.4.1. Temperature
The FFD operates without degradation at 1 atmosphere in the following air temperature ranges:
•
Commercial temperature version: 0
°
C to +70
°
C
•
Enhanced temperature version: -25
°
C to +75
°
C
•
Extended temperature version: -40
°
C to +85
°
C
The FFD meets the performance requirements specified herein after withstanding exposure
to a nominal ambient temperature of –40
°
C for not less than 3 days, and of +85
°
C for a
period of not less than 6 hours.
•
Storage temperature range: -55
°
C to +95
°
C
20
Product Specification and User Manual FFD 3.5" Ultra320 SCSI
43-PS-0305-00 Rev. 2.0
