ZyXEL Communications NSA221 User Manual page 272

Chapter 10 Package Management
Table 81 S.M.A.R.T. Attributes (continued)
ATTRIBUTE
ID
NAME
20 Thermal
5 Asperity Rate
(TAR)
20 Flying Height
6
20 Spin High
7 Current
20 Spin Buzz
8
20 Offline Seek
9 Performance
22 Disk Shift
0
22 G-Sense Error
1 Rate
22 Loaded Hours
2
22 Load/Unload
3 Retry Count
22 Load Friction
4
22 Load/Unload
5 Cycle Count
22 Load 'In'-time
6
22 Torque
7 Amplification
Count
22 Power-Off
8 Retract Cycle
23 GMR Head
0 Amplitude
23 Temperature
1
24 Head Flying
0 Hours
25 Read Error
0 Retry Rate
272
BETTE
DESCRIPTION
R
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.
Low This is the total number of load cycles.
This is the total time that the magnetic heads actuator
has had a load (not been in the parking area).
Low This is the number of attempts to compensate for
variations in platter speed.
Low This is how many times the magnetic armature was
automatically retracted because the power was cut.
This is the amplitude of thrashing (or the distance of
repetitive forward and reverse head motion).
Low This is the hard drive's temperature.
This is the total time that the head has been positioning.
Low This is the number of errors in reading from the disk.
NSA221 User's Guide