ZyXEL Communications NSA-2401 User Manual

Chapter 6 Storage Screens

NSA-2401 User’s Guide

207

Spin High 
Current

This is the quantity of high current used to spin up the drive.

208

Spin Buzz

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.

209

Offline Seek 
Performance

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.

220

Disk Shift 

Low

This is how far the disk has moved relative to the spindle (this 
kind of shift is usually due to shock).

221

G-Sense Error 
Rate 

Low

This is the number of errors that have resulted from external 
vibration and shock.

222

Loaded Hours

This is how long the hard drive has operated under data load (this 
requires movement of the magnetic head armature). 

223

Load/Unload 
Retry Count

This is how many time the magnetic head has changed position. 

224

Load Friction

Low

This is resistance caused by friction in mechanical parts during 
operation.

225

Load/Unload 
Cycle Count 

Low

This is the total number of load cycles.

226

Load 'In'-time

This is the total time that the magnetic heads actuator has had a 
load (not been in the parking area). 

227

Torque 
Amplification 
Count 

Low

This is the number of attempts to compensate for variations in 
platter speed.

228

Power-Off 
Retract Cycle 

Low

This is how many times the magnetic armature was automatically 
retracted because the power was cut.

230

GMR Head 
Amplitude

This is the amplitude of thrashing (or the distance of repetitive 
forward and reverse head motion).

231

Temperature Low

This 

is 

the hard drive’s temperature.

240

Head Flying 
Hours

This is the total time that the head has been positioning.

250

Read Error Retry 
Rate 

Low

This is the number of errors in reading from the disk. 

Table 42   S.M.A.R.T. Attributes  (continued)