ZyXEL Communications NSA-2401 User Manual page 156

Chapter 6 Storage Screens
Table 42 S.M.A.R.T. Attributes (continued)
ATTRIBUTE
ID
NAME
12 Device Power
Cycle Count
13 Soft Read Error
Rate
190 Airflow
Temperature
190 Temperature
Difference from
100
191 G-sense error
rate
192 Power-off
Retract Count
193 Load/Unload
Cycle
194 Temperature
195 Hardware ECC
Recovered
196 Reallocation
Event Count
197 Current Pending
Sector Count
198 Uncorrectable
Sector Count
199 UltraDMA CRC
Error Count
200 Write Error Rate /
Multi-Zone Error
Rate
201 Soft Read Error
Rate
202 Data Address
Mark Errors
203 Run Out Cancel
204 Soft ECC
Correction
205 Thermal Asperity
Rate (TAR)
206 Flying Height
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BETTER DESCRIPTION
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.
High This indicates the value of 100 - the temperature in degrees
Celsius. Manufacturers can set a minimum threshold that
corresponds to a maximum temperature.
Low This is the number of mistakes caused by impact loads.
Low This is how many times the heads are loaded off the media.
Low This is the number of load and unload cycles into head landing
zone position.
Low This is the hard drive's internal temperature.
High This is the time between ECC (Error Correction Code)-corrected
errors.
Low This is the total number of reallocation (remap) operations. The
raw value is the total attempts to move data from reallocated
sectors to a spare area. Successful and unsuccessful attempts
are both included.
Low This is the number of unstable sectors awaiting reallocation. If the
sector is later successfully written or read, this value decreases
and reallocation is not performed. Only failed write attempts
cause a reallocation, not read errors. This can be difficult to test
since only direct I/O writes to the disk cause reallocations, not
cached writes.
Low This is the number of errors reading or writing a sector that were
not correctable. An increase in this value is an indicator of disk
surface defects or mechanical subsystem problems.
Low This is the number of data transfer errors through the interface
cable according to the ICRC (Interface Cyclic Redundancy
Check).
Low This is the total number of errors in writing sectors.
Low This is the number of read/write head off-track errors. If the value
is not zero, make a backup.
Low This is the number of data address mark errors. This could also
be a different, manufacturer-specific attribute.
Low This is the number of ECC (Error Correction Code) errors.
Low This is the number of errors corrected by software ECC (Error
Correction Code).
Low This is the number of thermal asperity errors. Thermal asperity is
a read signal spike caused by sensor temperature rise due to
touching the disk surface or contaminant particles.
This is the height of the hard drive's read/write heads above the
disk surface.
NSA-2401 User's Guide