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Cycle Count
This attribute indicates the count of full
hard disk power on/off cycles.
Normalized Equation: 100 - (PCC /
1024)
Normalized Value Range:
Best = 100
Worst = 1
Raw Usage:
[3-0] : Cumulative lifetime power cycle
count (PCC)
The normalized equation for
Power Cycle Count decrements
by 1 for each 1024 power
cycle.
Rate
This attribute tracks the number of
correctable ECC errors (CECC). 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 wraps to
0.5x10^10 when it exceeds 10^12.
Normalized Equation:
10log10(BitsRead/SoftReadErrors + 1)
SectorsRead= Number of sectors read
SectorsToBits= 512*8
BitsRead= SectorsRead*SectorsToBits
Normalized Value Range:
Best = 100
Worst = 1
Invalid = 0
Raw Usage:
[3-0] : Number of sectors read
[6-4]: Soft Read Error Count (CECC)
includes all correctable ECC
(CECC) errors tracked by the
CONTROLLER. The normalized
equation for 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 120 to
38 (representing a BER range of
1.00E-13 to 1.68E-04) are
presented.
This Attribute reads ‘0’ until a
sample size between 10E10 and
10E12 is available to be tracked
Erased
This attribute counts the Gigabytes of
Flash memory erases across the entire
drive, over the life of the drive.
Raw Usage:
[3-0]: Gigabytes Erased
[6-4]: None (0x00)
This Attribute returns a byte
count in increments of 64
GBytes. The count represents
the number of bytes erased. The
The Attribute reads ‘0’ until the
byte count reaches 64 GB, at
which time the Attribute
changes to read ‘64’ (decimal).
For Flash memory consisting of
128-page blocks, each page of
which is 4k bytes, each 64 GB
