Originally posted by Anvh If i've two cards instead of one card then i have twice the risk that a card will fail on me right so how does that work out?
How does that work?
I understand the Mean Time Between Failures (MTBF) Is obtained in different ways namely tests in the lab, accumulated field failure records, or prediction models. You can obtain these data from only one unit or a number of units where each unit's datum is correlated to obtain a result as an average. The more units are tested the higher the MTBF figure will be until a plateau is reached, unless the units are so bad that all are failing then MTBF will be very low.
So if you test a number of units some will fail earlier than others and one can calculate an average MTBF. This means the more cards you take along on your trip the more you dilute the chance of experiencing a failure. Because if you are taking only one card and you are unlucky for this one to fail you will have experienced, as an individual, a 100% failure rate. But if this one rotten card is one of ten you took along you can see that you will spread your risk factor. (And you have nine others to carry on.)
This is my take of it.
Now how do you calculate MTBL ? (Mean Time Between Loss) I have got no bloody idea.
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