fail-safe: مجهز به سیستم خرابی ایمن
fail-soft: مجهز به سیستم خرابی ملایم

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Note added at 38 mins (2010-09-29 07:53:30 GMT)
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Fail-safe or fail-secure describes a device or feature which, in the event of failure, responds in a way that will cause no harm, or at least a minimum of harm, to other devices or danger to personnel. Fail-safe components of a system are distinguished from fail-secure components in that, in the former, component failure allows, but does not cause or invite, a certain improper system behavior. In the latter, component failure does not allow a certain improper system behavior, although some proper behaviors are impeded. For example, a lock that unlocks at the wrong time has failed, but it may be considered fail-safe if its failure does not send the door flying open or attract undue attention to the door's unlocked state. In contrast, a fail-secure lock will remain locked during a failure, but cannot be unlocked even with the correct key.

Significantly, despite popular belief to the contrary,[1] "fail safe" does not mean that the device or system is designed so that failure is impossible; it simply means that when failure does occur, it should occur in the safest fashion.[2]
http://www.answers.com/topic/fail-safe

http://en.wikipedia.org/wiki/Fail-safe

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Note added at 6 hrs (2010-09-29 14:00:39 GMT)
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