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Count
Tracks the total number of retired
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:
[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 Reallocation
Event Count attribute (#196).
(POH)
Count of hours in power-on state. The
raw value of this attribute shows total
count of hours in the power-on state.
Normalized Equation: 100 - (POH /
HPY * 10)
Normalized Value Range:
Best = 100
Worst = 1
Raw Usage:
The normalized equation for
Power-On hours decrements by
1 each 1/10 year. Note that
some manufacturers elect to
decrement by 1 for each 1/12
year of POH.
[3-0] : Total number of power-on hours
[6-4]: total number of milliseconds
since last
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:
The normalized equation for
Power Cycle Count decrements
by 1 for each 1024 power
cycle.
[3-0] : Cumulative lifetime power cycle
count (PCC)
