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2.Specification
Search Time
2.3.6.
Search Time means the period for the drive to find the position that is required by a command. This time also
depends on the tape length and the position of the head along the tape. The data in the below table represents the
average time for SDX-550V. The time it may take for retrying is not reflected here.
TAITE-20N
(98m)
Search Time
60 sec
Rewind Time
2.3.7.
Rewind Time means the period from the beginning to the end of rewinding sequence. This value depends on the
tape length and the position of the head along the tape. The data in the below table represents the average time for
SDX-550V. The time it may take for retrying is not reflected here.
TAITE-20N
(98m)
Rewind Time
55 sec
Error Rate
2.3.8.
The un-correctable bit error rate is expected to be less than 1 in 10 to the 17th.
Retry Limits on Rewrites
2.3.9.
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-550V 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-550V 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-550V is 5 years average.
2-8
SDX1-25C
SDX1-35C
TAIT1-40N
(170m)
(230m)
(186m)
85 sec
120 sec
105 sec
SDX1-25C
SDX1-35C
TAIT1-40N
(170m)
(230m)
80 sec
105 sec
Tape Motion Time
DutyCycle
PowerOn Time
TAIT1-40C
SDX2-50C
(186m)
(230m)
80 sec
120 sec
TAIT1-40C
SDX2-50C
(186m)
(186m)
(230m)
90 sec
90 sec
105 sec
100
SONY AIT-2 Turbo drive SDX-550V series Ver.1.0
TAIT2-80N
TAIT2-80C
(186m)
(186m)
105 sec
80 sec
TAIT2-80N
TAIT2-80C
(186m)
(186m)
90 sec
90 sec
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