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[5-4]: Lowest temperature (C; since
power-on)
reading; historical values are
highest or lowest of all sensors
polled.
Error Count
This attribute tracks the number of
uncorrectable ECC errors (UECC). The
normalized value is only computed
when the number of bits in the
"BitsRead" count is in the range of
10^10 to 10^12. The count is cleared at
power on reset and when >10^12
bits have been read.
Normalized Equation:
10log10(BitsRead/ECCOnTheFlyErrors
+ 1)
SectorsRead= Number of sectors read
SectorsToBits= 512*8
BitsRead= SectorsRead*SectorsToBits
Normalized Value Range:
Best = 100
Worst = 1
Invalid = 0
Raw Usage:
The ECC On The Fly error rate
includes all uncorrectable ECC
errors (UECC) tracked by
the CONTROLLER. The
normalized equation for ECC
On The Fly error rate is
logarithmic since the valid BER
range of the attribute spans from
1.00E-10 to 1.00E-12. To force
positive numbers, the numerator
and denominator are flipped.
One is then added to the number
of errors in the denominator to
avoid a divide-by-0 condition if
no errors are encountered. By
taking the log of the inverted
BER and multiplying by ten a
reasonable range of normalized
values from 120 to 38
(representing a BER range of
1.00E-13 to 1.68E-04 ) are
presented. As defined, this
Attribute is identical to Attribute
201 and Attribute 204.
This Attribute reads ‘0’ until a
sample size between 10E10 and
10E12 is available to be tracked
by this Attribute.
Note that many UECC errors
counted by this Attribute are
corrected by RAISE correction.
[3-0] : Number of sectors read
[6-4]: ECCOnTheFlyErrors (UECC)
count
