Product manual

Specifications
11
Environmental Requirements
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 Operational Nonoperational
Temperature +41
o
to +113
o
F
1
(+5
o
to + 45
o
C)
–40
o
to +149
o
F
2
(–40
o
to + 65
o
C)
Thermal gradient 2
o
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
o
F (28
o
C) No condensation
Altitude –100 to +4,575 meters –300 to +15,200
meters (power off)
Vibration 1.20 mm peak-to-peak 1.5 g (5 to 500 Hz)
Sweep Test (5–17 HZ)
0.73 G peak (17 to 150 Hz)
0.50 G peak (150–500 Hz)
(sweep rate 8 decades per
hour)
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 Scorpion 40 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-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
Mean time between failures
(MTBF)
412,000 hr at 20% duty cycle
Mean time to repair (MTTR) Less than 0.5 hour
Mean Time Between Failures
The mean time between failures (MTBF) is specified at 412,000 hours minimum.
This specification includes all power-on and operational time but excludes