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Specifications
Environmental Requirements
Reliability
Mean Time Between Failures
The following table lists the environmental specifications for DDS drives. The internal
drive should meet these standards if mounted either vertically (on its side) or
horizontally (right side up).
Specification
Temperature
Thermal gradient
Relative humidity
Maximum wet bulb temperature
Altitude
Vibration
Sweep Test
Acoustic level idling (A-wt sum)
Acoustic level operational
(A-wt sum)
Shock (1/2 sine wave)
1. Mechanism and media
The Scorpion 40 drive is designed for maximum reliability and data integrity. The
following table summarizes the reliability specifications.
Specification
Nonrecoverable error rate
Error recovery and control
Mean time between failures
(MTBF)
Mean time to repair (MTTR)
The mean time between failures (MTBF) is specified at 412,000 hours minimum.
This specification includes all power-on and operational time but excludes
Operational
o
o
1
+41
to +113
F
o
o
(+5
to + 45
C)
o
2
C per minute
(no condensation)
20% to 80%
1
noncondensing
o
o
82.4
F (28
C)
–100 to +4,575 meters
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)
47 dBA maximum
53 dBA maximum
10 Gs peak, 11 msec
2. Mechanism
Value
15
< 1 in 10
bits
Error-correction code techniques (C1, C2, & C3 ECC)
Read-after-write (RAW)
N -Group writing (DDS-1 and DDS-2 modes only)
Error monitoring and reporting (error log)
Retry on read
Data randomizer
Track checksum
412,000 hr at 20% duty cycle
Less than 0.5 hour
11
Nonoperational
o
o
2
–40
to +149
F
o
o
(–40
to + 65
C)
Below condensation
0% to 90%
2
noncondensing
No condensation
–300 to +15,200
meters (power off)
1.5 g (5 to 500 Hz)
—
—
—
0
0
100 Gs peak,
11 msec
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