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2. Specification
Unload Time
2.3.5.
Unload Time means the period from the beginning of the unload sequence caused by Unload Command or Eject
button to the time when a cassette is ejected from the slot. Unload Time does not include Rewind time. The data in
the below table represents the average time for SDX-470V. The time it may take for retrying is not reflected here.
TAITE-20N (98m)
Unload Time
30 sec
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-470V. The time it may take for retrying is not reflected here.
TAITE-20N (98m)
Search Time
70 sec
2.3.7.
Rewind Time
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-470V. The time it may take for retrying is not reflected here.
TAITE-20N (98m)
Rewind Time
60 sec
2.3.8.
Error Rate
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.
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-470V 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-470V 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.
2-8
SDX1-25C (170m)
SDX1-35C (230m)
20 sec
SDX1-25C (170m)
SDX1-35C (230m)
85 sec
SDX1-25C (170m)
SDX1-35C (230m)
80 sec
Tape Motion Time
DutyCycle =
PowerOn Time
TAIT1-40N (186m)
20 sec
30 sec
TAIT1-40N (186m)
120 sec
120 sec
TAIT1-40N (186m)
105 sec
90 sec
×100
SONY AIT-1 Turbo drive SDX-470V series Ver.1.0
TAIT1-40C (186m)
20 sec
TAIT1-40C (186m)
90 sec
TAIT1-40C (186m)
90 sec
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