S.M.A.R.T site Index Attributes Attributes are being used to retrieve current psychical/logical state of a drive and to show their meaning in much more readable form for end-user. Each attribute can have a certain collection of flags: Pre-failure warranty attribute (PW) - indicates a pre-failure condition (caused by exceeded threshold) where imminent loss of data is being predicted Online collection attribute (OC) - indicates that the value of this attribute is calculated during Online test Performance attribute (PE) - indicates degradation of performance caused by usage or age of a drive Error rate attribute (ER) - indicates that attribute measure frequency of errors Error count attribute (EC) - indicates that attribute is a counter of events Self-preserving attribute (SP) - indicates that attribute is automatically preservable and restored each time when performing S.M.A.R.T. tests Threshold is the worst value for attribute. Any value lower than (or equal to) threshold means decreased performance or even hard disk failure. ID Name of attribute Description 1 Raw Read Error Rate Frequency of errors appearance while reading RAW data from a disk 2 Throughput Performance The average efficiency of hard disk 3 Spin Up Time Time needed by spindle to spin-up 4 Start/Stop Count Number of start/stop cycles of spindle 5 Reallocated Sector Count Quantity of remapped sectors 6 Read Channel Margin Reserve of channel while reading 7 Seek Error Rate Frequency of errors appearance while positioning 8 Seek Time Performance The average efficiency of operations while positioning 9 Power-On Hours Count Quantity of elapsed hours in the switched-on state 10 Spin-up Retry Count Number of attempts to start a spindle of a disk 11 Calibration Retry Count Number of attempts to calibrate a drive 12 Power Cycle Count Number of complete start/stop cycles of hard disk 13 Soft Read Error Rate Frequency of "program" errors appearance while reading data from a disk 191 G-Sense Error Rate Frequency of mistakes appearance as a result of impact loads 192 Power-Off Retract Cycle Number of the fixed 'turning off drive' cycles (Fujitsu: Emergency Retract Cycle Count) 193 Load/Unload Cycle Count Number of cycles into Landing Zone position 194 HDA Temperature Temperature of a Hard Disk Assembly 195 Hardware ECC Recovered Frequency of the on the fly errors (Fujitsu: ECC On The Fly Count) 196 Reallocated Event Count Quantity of remapping operations 197 Current Pending Sector Count Current quantity of unstable sectors (waiting for remapping) 198 Off-line Scan Uncorrectable Count Quantity of uncorrected errors 199 UltraDMA CRC Error Rate Total quantity of errors CRC during UltraDMA mode 200 Write Error Rate Frequency of errors appearance while recording data into disk (Western Digital: Multi Zone Error Rate) 201 Soft Read Error Rate Frequency of the off track errors (Maxtor: Off Track Errors) 202 Data Address Mark Errors Frequency of the Data Address Mark errors 203 Run Out Cancel Frequency of the ECC errors (Maxtor: ECC Errors) 204 Soft ECC Correction Quantity of errors corrected by software ECC 205 Thermal Asperity Rate Frequency of the thermal asperity errors 206 Flying Height The height of the disk heads above the disk surface 207 Spin High Current Quantity of used high current to spin up drive 208 Spin Buzz Quantity of used buzz routines to spin up drive 209 Offline Seek Performance Drive's seek performance during offline operations 220 Disk Shift Shift of disk is possible as a result of strong shock loading in the store, as a result of it's falling or for other reasons (sometimes: Temperature) 221 G-Sense Error Rate This attribute is an indication of shock-sensitive sensor - total quantity of errors appearance as a result of impact loads (dropping drive, for example) 222 Loaded Hours Loading on drive caused by the general operating time of hours it stores 223 Load/Unload Retry Count Loading on drive caused by numerous recurrences of operations like: reading, recording, positioning of heads, etc. 224 Load Friction Loading on drive caused by friction in mechanical parts of the store 225 Load/Unload Cycle Count Total of cycles of loading on drive 226 Load-in Time General time of loading for drive 227 Torque Amplification Count Quantity efforts of the rotating moment of a drive 228 Power-Off Retract Count Quantity of the fixed turning off's a drive 230 GMR Head Amplitude Amplitude of heads trembling (GMR-head) in running mode 231 Temperature Temperature of a drive 240 Head Flying Hours Time while head is positioning 250 Read Error Retry Rate Frequency of errors appearance while reading data from a disk Please note that some disk manufacturers use their own ID's for attributes. Thanks to Bruce Allen for attributes and descriptions.