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Correction Rate
(UECC)
Number of errors corrected by RAISE
that cannot be fixed on-the-fly and
requires RAISE to correct. 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/UECC + 1)
SectorsRead= Number of sectors read
SectorsToBits= 512*8
BitsRead= SectorsRead*SectorsToBits
Normalized Value Range:
Best = 130
Worst = 38
Invalid = 0
Raw Usage:
[3-0] : Number of sectors read
[6-4]: Soft ECC correction count
(UECC)
The Soft ECC Correction Rate
includes all uncorrectable ECC
(UECC) errors tracked by
the CONTROLLER. The
normalized equation for Soft
ECC Correction 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 130 to
38 (representing a BER range of
1.00E-13 to 1.68E-04 ) are
presented. As defined this
attribute is identical to 195 and
201.
This Attribute reads ‘0’ until a
sample size between 10E10 and
10E12 is available to be tracked
Indicates the approximate SSD life left,
in terms of PE cycles and Flash blocks
currently available for use.
Normalized Equation:
SSD Life Left = MIN[ MAX(termA, 10),
termB]
termA = (Unused)/(Rated) x 100
Unused = (unused PE cycles)
Rated = (rated PE cycles)
termB = (AvailExcess)/(OrigExcess)
AvailX = (Blocks above min req’d)
OrigX = (Original blks above min
req’d)
SSD life left is based on actual
usage and takes into account PE
cycle consumption and Flash
block retirement.
PE cycle usage at a rate less
than the rate used for
performance throttling will result
in extending drive life. Actual
Flash endurance remaining is
normally greater than the
unused rated PE cycles.
Note that block retirement rate
also affects SSD life and this
