Reliability; Mean Time Between Failures; Mean Time To Repair - Seagate STD124000N Product Manual

Maintenance and Reliability

Reliability

Mean Time Between Failures

Mean Time to Repair

Product Manual
The Scorpion 24 drive is designed for maximum reliability and data integrity. The
following table summarizes the reliability specifications.
Feature
Nonrecoverable error rate
Error recovery and control
Mean time between failures
(MTBF)
Mean time to repair (MTTR)
The mean time between failures (MTBF) is specified at 200,000 hours minimum.
This specification includes all power-on and operational time but excludes
maintenance periods. Operational time is assumed to be 20 percent of the power-on
time. Operational time is the time the tape is loaded on the cylinder (tape moving or
cylinder rotating).
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.
The mean time to repair (MTTR) is the average time required by a qualified service
technician to diagnose a defective drive and to install a replacement drive. The
MTTR for DAT products is less than 0.5 hour (30 minutes).
The Seagate DDS drives are field-replaceable units. If a problem occurs with a
subassembly or component in the drive, you should replace the entire unit. Return
the drive to the factory in its original packaging. Contact your distributor, dealer, your
computer system company or your Seagate sales representative to arrange the
return.
Specification
15
< 1 in 10 bits
Error-correction code techniques (C1, C2, & C3 ECC)
Read-after-write (RAW)
N -Group writing
Error monitoring and reporting (error log)
Media specification
Retry on read
Data randomizer
Track checksum
200,000 hours @ 20% duty cycle
Less than 0.5 hour
Chapter 9
Page 85