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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 CONTROLLER use. This
value is set at factory configuration
time.
Normalized Value Range:
Best = 100
Worst = 1
Raw Usage:
[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).
Sector Count
The total number of uncorrectable
errors when reading/writing a sector. A
rise in the value of this attribute
indicates defects of the flash memory
device. Note that the native
CONTROLLER sector size is 4k bytes.
Normalized Equation:
10*log10(TotalSectors/URAISE + 1)
TotalSectors= Total number of sectors
on the drive.
URAISE= Uncorrectable Error Count
Normalized Value Range:
Best = 120
Worst = 1
Invalid = 0
Raw Usage:
[3-0] : Uncorrectable sector count
(URAISE) this power cycle
[6-4] : Number of sectors read this
The difference between this
count and reported
uncorrectable will be those
errors correctable by RAISE.
The normalized equation for this
Attribute is logarithmic since the
valid BER range of the attribute
spans from 1.00E-10 to 1.00E-
12.
This Attribute reads ‘120’ until a
sample size between 10E10 and
10E12 is available to be tracked
by this Attribute.
