對於重視資料安全的場合，使用者只能儘量降低機率，與降低意外發生後的影響範圍。
有時候越穩定的系統導致的災情越嚴重，這往往是起因於對系統的充足信心，而忽略了風險的存在。
[edited]
補一篇資料提供參考：
Assessing the Reliability of RAID Systems (DELL)
http://www1.ap.dell.com/content/top...c=tw&l=zh&s=bsd
(圖出自 Dell)
引用:
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Although a single disk array can contain multiple RAID sets of different RAID levels and disk capacities, the examples in this article are based on an array of 14 HDDs dedicated to one RAID level at a time. All examples use a hypothetical 40 GB HDD possessing a reliability figure-of-merit of .90 over three years with a 100 percent duty cycle.
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