ZyXEL Communications NSA310 User Manual page 277

Table 90 S.M.A.R.T. Attributes (continued)
ATTRIBUTE
ID
NAME
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
207 Spin High
Current
208 Spin Buzz
209 Offline Seek
Performance
220 Disk Shift
221 G-Sense Error
Rate
222 Loaded Hours
223 Load/Unload
Retry Count
224 Load Friction
Media Server User's Guide
BETTER DESCRIPTION
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.
This is the quantity of high current used to spin up the drive.
This is the number of buzz routines to spin up the drive. When the arm
holding the read/write heads is stuck, the motor driving it tries to oscillate
the arm to free it. This causes an audible vibration.
This is the hard drive's seek performance during offline operations. Offline
operations are tests the drive does itself as opposed to those that an
external diagnostic tool has it do. Seek performance is how quickly the
drive moves from track to track.
Low This is how far the disk has moved relative to the spindle (this kind of
shift is usually due to shock).
Low This is the number of errors that have resulted from external vibration
and shock.
This is how long the hard drive has operated under data load (this
requires movement of the magnetic head armature).
This is how many time the magnetic head has changed position.
Low This is resistance caused by friction in mechanical parts during operation.
Chapter 11 Package Management
277