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ECMA
European Computer Manufacturers Association.
Eccentricity
- The distance between the geometric centre of a
circular feature on the disk and the centre which
coincides with the centring feature of the disk.
A more specific term is concentricity.
- The deviation from a true circular path of
circular feature of the disk expressed in the
difference between the maximum and minimum
distance from the geometric centre of the disk. A
more specific term is circularity.
Error
The discrepancy between a computed, observed
or measured value and the true, specified or
theoretically correct value.
Error
Correcting Code (ECC)
1. (ANSI) A code in which each acceptable
expression conforms to specific rules of construction
that also define one or more equivalent nonacceptable
expressions, so that if certain errors occur in an
acceptable expression, the result will be one of its
equivalents and thus the error can be corrected.
2. An error-detecting code designed to correct certain
kinds of errors is data.
Error
Detection and Correction (EDAC)
A family of methods in which redundancy is
added to data in known fashion and is written with the
data. Upon readback, a decoder removes the redundancy and
uses the redundant information to detect and correct
erroneous channel systems.
Error Rate
(ANSI) The ratio of the number of data units
in error to the total number of data units.
Error Rate,
Uncorrectable
This is a function of the raw bit error rate
and the error detection and correction system used, and
is measured by the ratio of the number of hard
(uncorrectable) errors to the total user capacity.
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