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2.Specification
Error Rate
2.3.8.
The un-correctable bit error rate is expected to be less than 1 in 10 to the 17th.
2.3.9.
Retry Limits on Rewrites
For Read-after-Write error correction, each frame can be rewritten up to a maximum of 63 times giving 64 writes of
the frame. With Repeat Writing, where every group is written a fixed number of times, the upper limit is 5.
2.3.10. Definition of Failure
A failure is defined as any permanent manufacture of the drive that prevents the user from retrieving data from tape.
This includes failure to power up, failure to unload or eject a cassette, or failure to write and read data to and from the
tape, providing that both the drive and tape are being used within specification.
Faults are not considered failures when they are related to operator error mishandling and abuse, system-related
faults (cabling problems unsupported systems, operating software and so on) no trouble found, and transportation
damage.
2.3.11. Mean Time Between Failures
The Mean Time Between Failures (MTBF) for the SDX-250V is 300,000 power-on hours, assuming a duty cycle of
100%, where:
2.3.12. Mean Time to Repair
The Mean Time To Repair (MTTR) of the SDX-250V is 30 minutes. Since at the field level the entire drive is
considered a Field Replaceable Unit (FRU) the time to replace the drive with a new one is less that 30 minutes.
2.3.13. Component Life
The specified life of the SDX-250V is 5 years average.
2.3.14. Durability
The durability of the components in the SDX-250V will exceed the number of operations listed on the following table:
Start/Stop
Reposition
Thread/Unthread
Load/Eject
2-8
Tape Motion Time
DutyCycle
PowerOn Time
400,000 times
3,000,000 times
100,000 times
100,000 times
100
SONY AIT-E Turbo drive SDX-250V series Ver.1.0
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