Chapter 5 Storage Manager
NAS Series User’s Guide
79
10 Spin Retry Count 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.
11 Recalibration
Retries
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.
12 Device Power
Cycle Count
This is the number of times the hard drive has gone through a full power on
and power off.
13 Soft Read Error
Rate
Low This is the number of uncorrected read errors the hard drive has reported. If
this is not zero, back up your data.
190 Airflow
Temperature
Low This indicates the temperature of the airflow measured by a Western Digital
hard drive.
190 Temperature
Difference from
100
High This indicates the value of 100 - the temperature in degrees Celsius.
Manufacturers can set a minimum threshold that corresponds to a maximum
temperature.
191 G-sense error rate Low This is the number of mistakes caused by impact loads.
192 Power-off Retract
Count
Low This is how many times the heads are loaded off the media.
193 Load/Unload
Cycle
Low This is the number of load and unload cycles into head landing zone position.
194 Temperature Low This is the hard drive’s internal temperature.
195 Hardware ECC
Recovered
High This is the time between ECC (Error Correction Code)-corrected errors.
196 Reallocation
Event Count
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.
197 Current Pending
Sector Count
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.
198 Uncorrectable
Sector Count
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.
199 UltraDMA CRC
Error Count
Low This is the number of data transfer errors through the interface cable
according to the ICRC (Interface Cyclic Redundancy Check).
200 Write Error Rate /
Multi-Zone Error
Rate
Low This is the total number of errors in writing sectors.
201 Soft Read Error
Rate
Low This is the number of read/write head off-track errors. If the value is not zero,
make a backup.
202 Data Address
Mark Errors
Low This is the number of data address mark errors. This could also be a different,
manufacturer-specific attribute.
203 Run Out Cancel Low This is the number of ECC (Error Correction Code) errors.
204 Soft ECC
Correction
Low This is the number of errors corrected by software ECC (Error Correction
Code).
205 Thermal Asperity
Rate (TAR)
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.
Table 36 S.M.A.R.T. Attributes (continued)
ID
ATTRIBUTE
NAME
BETTER DESCRIPTION
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