Attributes - ZyXEL Communications NSA310S User Manual

Chapter 10 Packages
10.14.1 S.M.A.R.T Attributes
The following table describes some common S.M.A.R.T. attributes. If a higher or lower raw attribute
value is better, it is indicated in the BETTER column. Since S.M.A.R.T. attributes and their
definitions vary by manufacturer, refer to the hard drive manufacturer for details about the
attributes your hard drive supports.
Table 89 S.M.A.R.T. Attributes
ATTRIBUTE
ID
NAME
01 Read Error Rate
02 Throughput
Performance
03 Spin-Up Time
04 Start/Stop Count
05 Reallocated
Sectors Count
06 Read Channel
Margin
07 Seek Error Rate
08 Seek Time
Performance
09 Power-On Hours
(POH)
10 Spin Retry Count
11 Recalibration
Retries
12 Device Power
Cycle Count
13 Soft Read Error
Rate
190 Airflow
Temperature
262
BETTER DESCRIPTION
Low Shows the rate of hardware read errors. If this is not zero, there is a
problem with the disk surface or the read/write heads.
High This is the hard drive's general (overall) throughput performance. A
decreasing value indicates a problem.
Low This is the average number of milliseconds the hard drive took for spindle
spin up (from zero RPM to fully operational).
The total number of spindle start and stop cycles.
Low Total number of reallocated sectors on the hard drive. When the hard
drive detects a read/write/verification error, it marks the sector as
"reallocated" and transfers the data to a specially reserved (spare) area.
The process is also known as remapping with "reallocated" sectors known
as remaps. The more sectors the hard drive has to reallocate, the slower
read and write speeds become.
This is the margin of a channel when it reads data.
Low This is the rate of the magnetic heads' seek errors. A failure in the
mechanical positioning system, such as servo damage or a thermal
widening of the disk, results in seek errors. An increasing number of seek
errors indicate the condition of the disk surface and the mechanical
subsystem are worsening.
High This is an average performance indicator for the seek operations of the
magnetic heads. Mechanical subsystem problems cause this value to
decrease.
Low This is how many hours the hard drive has been in a power-on state. The
raw value lists the total number of hours (or minutes, or seconds
depending on the manufacturer).
Low This is the total number of spin start retry attempts. This is the number of
attempts to spin up to fully operational speed the hard drive has made
when the first attempt did not succeed. An increase in this value is an
indicator of hard disk mechanical subsystem problems.
High This is the number of times recalibration was requested when the first
attempt did not succeed. A decrease in this value is an indicator of hard
disk mechanical subsystem problems.
This is the number of times the hard drive has gone through a full power
on and power off.
Low This is the number of uncorrected read errors the hard drive has
reported. If this is not zero, back up your data.
Low This indicates the temperature of the airflow measured by a Western
Digital hard drive.
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