Parameter
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Type
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Description
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[Standard FIDES Parameters]
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For more information, see FIDES Standard Part Parameters.
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Type of Use
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Choice List
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The way in which the device is used. Choices are:
• Normal Use
• Intensive Use, Ventilated
• Intensive Use, Not Ventilated
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Protection
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Choice List
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The way in which the device is protected from damage. Choices are:
• Protection against shocks/vibrations
• Qualification for shocks/vibrations
• No special protection or qualification
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Portable
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Choice List
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Indicates if the device is fixed or portable.
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Type
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Choice List [Parts Count also]
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The type of device. Choices are:
• EIDE Hard Disk
• SCSI Hard Disk
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Hard Disk Size
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Real (in)
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The size of the device in inches.
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Avg. Access Time
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Real (ms)
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The average time for the device to access and return requested data in milliseconds.
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Duty Cycle
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Real
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The percentage of time that the device is in an operational (on) state.
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# of Disk Platters
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Integer
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The number of rapidly rotating platters with magnetic regions that store digitally encoded data.
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Life Time (L10)
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Real (Hours)
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Required only by the FIDES 2009 model.
Expresses product life by means of the L10 parameter, which corresponds to the time at which 10% of wearout failures occur. These failures are additional to so-called random failures that are modeled using the exponential distribution with a constant failure rate.
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MTTP Preventive Maintenance
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Real (Hours)
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Required only by the FIDES 2009 model.
The mean or average time between two periodic preventive maintenance operations. When the maintenance policy does not include any preventive maintenance, the average failure rate is calculated over the average period between two corrective maintenance operations due to wear-out failure using the parameter values provided below.
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Usage Rate
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Real
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Required only by the FIDES 2009 model.
The usage rate during the duration of the life profile specified by Life Time (L10). This value is the sum of the operating times divided by the total duration.
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Shape Factor β
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Real
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Required only by the FIDES 2009 model.
The shape factor for the Weibull distribution, which is used to model the wear-out type.
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[Derating Parameters]
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For more information, see Derating Parameters.
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