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Event Count
Tracks the total number of reallocated
Flash blocks.
Normalized Equation:
Count = 100 - (100* RBC / MRB)
RBC = RetiredBlockCount = Number
of retired blocks.
MRB = MinimumReqBlocks =
Minimum number of reserve blocks
available for contoller use. This value is
set at factory configuration time.
Normalized Value Range:
Best = 100
Worst = 1
Raw Usage:
[6-4] : None (0x00)
[3-0] : Retired block count
The normalized equation for this
attribute decrements as blocks
are retired and the reserve
(over-provisioned) block count is
decremented. (Note that all
blocks, including reserve blocks,
are in service at all times;
reserve blocks constitute Flash
memory space over and above
the drive’s logical capacity.)
As defined, this attribute is
identical to the Retired Block
Count attribute (#5).
Soft Read Error
(UECC)
Number of soft read errors that cannot
be fixed on-the-fly and requires deep
recovery provided by RAISE. 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]: Uncorrectable Soft error count
(UECC)
The Uncorrectable Soft Read
Error Rate includes all
uncorrectable ECC (UECC)
errors tracked by the
CONTROLLER. The normalized
equation for Uncorrectable Soft
Read 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 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
204.
This Attribute reads ‘0’ until a
sample size between 10E10 and
10E12 is available to be tracked
