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Chapter 5 Specifications
Mean Time Between Failures
LTO-2 Half-Height Tape Drive User’s Guide 43
Table 9 Reliability
Mean Time Between Failures 5
The mean time between failures (MTBF) for the internal drive is specified
at 250,000 hours minimum. This specification includes all power-on and
operational time but excludes maintenance periods. Operational time is
assumed to be 100 percent of the power-on time. Operational time is the
time the tape is loaded.
The MTBF for the desktop drive power supply is 50,000 hours with the
unit operated at full load and 25°C.
Specification Description
Non-recoverable error rate < 1 in 10
17
bits
Error recovery and control • Error correction code techniques (C1
and C2 ECC)
• Read-after-write (RAW)
• Error monitoring and reporting (error
log)
•Retry on
Mean time between
failures (MTBF)
250,000 hours MTBF at 100% duty cycle:
power applied and tape moving
continuously
(Desktop drive; 50,000 hours at full load
and 25°C)
Cartridge load/unload 100,000 cartridge load/unload cycles (no
thread)
Mean time to replace
(MTTR)
Less than 30 minutes
Note: The MTBF rating does not represent any particular drive, but
is derived from a large database of test samples. Actual rates
may vary from unit to unit.