User's Manual

Specifications 9
Environmental Requirements
The following table lists the environmental specifications for Scorpion 240.
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 min / 8
o
C per hr
(no condensation)
Below condensation
Relative humidity 20% to 80% noncondensing
1
0% to 90%
noncondensing
2
Maximum wet bulb
temperature
78.8
o
F (26
o
C) No condensation
Altitude –100 to +4,575 meters –300 to +15,200
meters (power off)
Vibration 1.5 G (5 to 500 Hz)
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)
Dwell test
(15 minutes)
0.90 mm peak-to-peak (5–17 Hz)
0.55 G peak (17 to 150 Hz)
0.25 G peak (150–500 Hz)
Acoustic level idling
(A-wt sum)
47 dBA maximum NA
Acoustic level operational
(A-wt sum)
60 dBA maximum NA
Shock (1/2 sine wave) 10 Gs peak, 11 msec 50 Gs peak,
11 msec
1. Mechanism and media 2. Mechanism
Reliability
The Scorpion 240 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)
100,000 power-on hours at 30% duty cycle
Cassette Load/Unload 150,000 cycles (assuming 60-second swap times)
Power On/Off 10,000 cycles
Magazine Load/Unload 25,000 cycles
Mean time to repair (MTTR) Less than 0.5 hour