What are S.M.A.R.T attributes?

2018-06-28 15:30

SMART attributes are a series of raw values reported by drives during operation. These attributes can be used to interpret the health of the drives and in some cases even predict an imminent hardware failure. Currently, there's no standard for which attributes a drive manufacturer should report, in what format and how each attribute must be interpreted. 

The following list contains some S.M.A.R.T. attributes and the typical meaning of their raw values:

ID Name Description
1 Read Error Rate  The rate of hardware read errors that occurred when reading data
 Throughput Performance  Throughput performance of a hard disk drive.
 Spin-Up Time  Average time of spindle to spin up from zeo RPM to fully operational
 Start/Stop Count  A counter of spindle start/stop cycle
 Reallocated Sectors Count  The count of bad sectors that have been found and remapped
 Read Channel Margin  Margin of a channel while reading data
 Seek Error Rate  Rate of seek errors of the magnetic heads
 Seek Time Performance  Average performance of seek operations of the magnetic heads.
9  Power-On Hours  Total amount of hours the disk has been operational
10   Spin Retry Count  Total count of the spin start attempts
11  Calibration Retry Count  Total count of recallibrations requested
12   Power Cycle Count  The count of full hard disk power on/off cycles.
13   Soft Read Error Rate  Uncorrected read errors reported to the operating system.
22  Current Helium Level  This value measures the helium inside of the drive
170   Available Reserved Space  -
171  SSD Program Fail Count The total number of flash program operation failures since the drive was deployed
172  SSD Erase Fail Count The number of flash erase failures
173  SSD Wear Leveling Count The maximum worst erase count on any block.
174  Unexpected power loss count The number of unclean shutdowns.
175  Power Loss Protection Failure
176  Erase Fail Count The number of flash erase command failures
177  Wear Range Delta Delta between most-worn and least-worn Flash blocks
179  Used Reserved Block Count Total  -
180  Unused Reserved Block Count Total  -
181  Program Fail Count Total  Total number of Flash program operation failures since the drive was deployed
182  Erase Fail Count -
183  Runtime Bad Block
184  End-to-End error Number of parity errors during transfer between the cache RAM and the host 
185  Head Stability -
186  Induced Op-Vibration Detection
187  Reported Uncorrectable Errors The count of errors that could not be recovered using hardware ECC 
188  Command Timeout The count of aborted operations due to HDD timeout
189  High Fly Writes Number of unsafe write operations outside the normal head flying range.
190  Airflow Temperature The temperature of the air inside the hard disk housing.
191  G-sense Error Rate The count of errors resulting from externally induced shock and vibration. 
192  Power-off Retract Count, Number of power-off or emergency retract cycles 
193  Load Cycle Count Number of cycles the head moved into landing zone position. 
194  Temperature The temperature of the disk 
195  Hardware ECC Recovered Number of errors corrected by the internal error correcting mechanism. 
196  Reallocation Event Count Count of remap operations. 
197  Current Pending Sector Count[ Count of unstable sectors 
198  (Offline) Uncorrectable Sector Count The total count of uncorrectable errors when reading/writing a sector.
199  UltraDMA CRC Error Count The count of errors in data transfer via the interface cable as determined by ICRC (Interface Cyclic Redundancy Check). 
200  Multi-Zone Error Rate The count of errors found when writing a sector.  
201  Soft Read Error Rate The total count of errors when writing a sector. 
202  Data Address Mark Errors Count of Data Address Mark errors 
203  Run Out Cancel The number of errors caused by incorrect checksum during the error correction. 
204  Soft ECC Correction Count of errors corrected by the internal error correction software 
205  Thermal Asperity Rate Count of errors due to high temperature 
206  Flying Height Height of heads above the disk surface 
207  Spin High Current The current needed to spin up the drive. 
208  Spin Buzz Count of buzz routines needed to spin up the drive due to insufficient power 
209  Offline Seek Performance Drive’s seek performance during its internal tests 
210  Vibration During Write A recording of a vibration encountered during write operations 
211  Vibration During Write A recording of a vibration encountered during write operations 
212  Shock During Write A recording of shock encountered during write operations 
220  Disk Shift Distance the disk has shifted relative to the spindle (usually due to shock or temperature) 
221  G-Sense Error Rate The count of errors resulting from externally induced shock and vibration
222  Loaded Hours Time spent operating under data load  
223  Load/Unload Retry Count Count of times head changes position 
224  Load Friction Resistance caused by friction in mechanical parts while operating
225  Load/Unload Cycle Count Total count of load cycles 
226  Load 'In'-time Total time of loading on the magnetic heads actuator 
227  Torque Amplification Count Count of attempts to compensate for platter speed variations 
228  Power-Off Retract Cycle The number of times the head was retracted as a result of power loss 
230  GMR Head Amplitude Head moving distances between operations. 
231  Life Left (SSDs) Indicates the approximate SSD life left 
232  Endurance Remaining
233  Media Wearout Indicator (SSDs)
234  Average erase count AND Maximum Erase Count
235  Good Block Count AND System(Free) Block Count
240  Head Flying Hours Time spent during the positioning of the drive heads 
241  Total LBAs Written Total count of LBAs written. 
242  Total LBAs Read Total count of LBAs read.
243  Total LBAs Written Expanded -
244  Total LBAs Read Expanded
249  NAND Writes Total NAND Writes. 
250  Read Error Retry Rate Count of errors while reading from a disk. 
251  Minimum Spares Remaining The number of remaining spare blocks as a percentage of the total number of spare blocks available 
252  Newly Added Bad Flash Block The total number of bad flash blocks the drive detected since it was first initialized in manufacturing
254  Free Fall Protection Number of free fall events detected by the accelerometer sensor.




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