IBM DDS Gen 5, User Manual

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Environmental requirements
The following table lists the environmental specifications for the DDS Gen 5 drive.
The internal drive should meet these standards if mounted either vertically (on its
side) or horizontally (right side up).
Specifications Operational Nonoperational
Temperature +41° to +113°F
1
(+5° to
+45°C)
-40° to +149°F
2
Thermal gradient 2°C per minute (no
condensation) Below condensation
Relative humidity 20% to 80% noncondensing
1
0% to 90% noncondensing
2
Maximum wet bulb
temperature 82.4°F (28°C) No condensation
Altitude -100 to +4,575 meters -300 to +15,200 meters
(power on)
Vibration
Sweep test
1.20 mm peak-to-peak
(5-17 HZ)
0.73 G peak (17 to 150 Hz)
0.50 G peak (150-500 Hz)
(sweep rate 8 decades per
hour)
1.5 g (5 to 500 Hz)
-
-
-
Acoustic level idling (A-wt
sum) 47 dBA maximum 0
Acoustic level operational
(A-wt sum) 53 dBA maximum 0
Shock (1/2 sine wave) 10 Gs peak, 11 msec 100 Gs peak, 11 msec
1
Mechanism and media
2
Mechanism
Reliability
The DDS Gen 5 drive is designed for maximum reliability and data integrity. The
following table summarizes the reliability specifications.
Specification Value
Nonrecoverable error rate < 1 in 10
15
bits
Error recovery and control Error-correction code techniques (C1, C2, &
C3 ECC)
Read-aftew-write (RAW)
N -group writing
Mean time between failures (MTBF) 412,000 hr at 20% duty cycle
Mean time to repair (MTTR) Less than 0.5 hour
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DDS Gen 5 Tape Drive: User’s Guide