ZyXEL NSA325 User Guide - Page 273

Chapter 11 Package Management Table 88 S.M.A.R.T. Attributes (continued) ID ATTRIBUTE NAME BETTER DESCRIPTION 192 Power-off Retract Low Count This is how many times the heads are loaded off the media. 193 Load/Unload Low This is the number of load and unload cycles into head landing zone Cycle 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 Low This is the total number of reallocation (remap) operations. The raw value Event Count is the total attempts to move data from reallocated sectors to a spare area. Successful and unsuccessful attempts are both included. 197 Current Pending Low Sector Count 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 Low Sector Count 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 Low Error Count This is the number of data transfer errors through the interface cable according to the ICRC (Interface Cyclic Redundancy Check). 200 Write Error Rate Low / Multi-Zone Error Rate This is the total number of errors in writing sectors. 201 Soft Read Error Low Rate This is the number of read/write head off-track errors. If the value is not zero, make a backup. 202 Data Address Low Mark Errors 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 Low Rate (TAR) 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. 206 Flying Height This is the height of the hard drive's read/write heads above the disk surface. 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). Media Server User's Guide 273