In this article I’ll look at the SMART information of the first SSD drive that comes under the arm and describe what the attributes mean.
Suppose we looked at the information on the disk /dev/sda:
sudo smartctl -a /dev/sda
I have the following information:
ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE 1 Raw_Read_Error_Rate 0x000b 100 100 050 Pre-fail Always - 0 2 Throughput_Performance 0x0005 100 100 050 Pre-fail Offline - 0 3 Spin_Up_Time 0x0007 100 100 050 Pre-fail Always - 0 5 Reallocated_Sector_Ct 0x0013 100 100 050 Pre-fail Always - 0 7 Unknown_SSD_Attribute 0x000b 100 100 050 Pre-fail Always - 0 8 Unknown_SSD_Attribute 0x0005 100 100 050 Pre-fail Offline - 0 9 Power_On_Hours 0x0012 100 100 000 Old_age Always - 2850 12 Power_Cycle_Count 0x0012 100 100 000 Old_age Always - 10 168 Unknown_Attribute 0x0012 100 100 000 Old_age Always - 0 170 Unknown_Attribute 0x0003 100 100 010 Pre-fail Always - 531 173 Unknown_Attribute 0x0012 100 100 000 Old_age Always - 12255496 175 Program_Fail_Count_Chip 0x0013 100 100 050 Pre-fail Always - 0 187 Reported_Uncorrect 0x0012 100 100 000 Old_age Always - 0 192 Power-Off_Retract_Count 0x0012 100 100 000 Old_age Always - 5 194 Temperature_Celsius 0x0023 071 067 030 Pre-fail Always - 29 (Min/Max 23/33) 196 Reallocated_Event_Count 0x0002 100 100 010 Old_age Always - 0 197 Current_Pending_Sector 0x0032 100 100 000 Old_age Always - 0 199 UDMA_CRC_Error_Count 0x000b 100 100 050 Pre-fail Always - 0 218 Unknown_Attribute 0x000b 100 100 050 Pre-fail Always - 0 231 Temperature_Celsius 0x0013 100 100 000 Pre-fail Always - 94 233 Media_Wearout_Indicator 0x000b 100 100 000 Pre-fail Always - 50171 240 Unknown_SSD_Attribute 0x0013 100 100 000 Pre-fail Always - 0 241 Total_LBAs_Written 0x0012 100 100 000 Old_age Always - 12213 242 Total_LBAs_Read 0x0012 100 100 000 Old_age Always - 321 244 Unknown_Attribute 0x0002 100 100 000 Old_age Always - 187 245 Unknown_Attribute 0x0002 100 100 000 Old_age Always - 264 246 Unknown_Attribute 0x0012 100 100 000 Old_age Always - 12905344
Raw_Read_Error_Rate – means the number of read errors.
Throughput_Performance – overall disk performance.
Spin_Up_Time – time to drive up to the operating speed.
Reallocated_Sector_Ct – number of redistributed (damaged) sectors.
Power_On_Hours – the number of hours that the disk was working.
Power_Cycle_Count – number of disk on/off.
Program_Fail_Count_Chip – number of write errors in flash memory.
Reported_Uncorrect – hardware ECC errors that can not be fixed.
Power-Off_Retract_Count – number of emergency shutdowns.
Temperature_Celsius – the temperature of the disc in degrees Celsius.
Media_Wearout_Indicator – the health indicator of the disc, if it is below 10, then the disc should definitely be replaced.
Total_LBAs_Written – LBA records.
Total_LBAs_Read – LBA reads.
There may also be other attributes:
Start_Stop_Count – number of starts/stops of the spindle.
Seek_Error_Rate – number of positioning errors.
Spin_Retry_Count – number of retry attempts.
Reallocated_Event_Count – number of sector redistribution operations.
Offline_Uncorrectable – number of faulty sectors.
Flying height – height between the head and the surface of the disc.
Disk Shift – the distance of the disc block displacement from the spindle, can change for example after the falls.
G-Sense Error Rate – errors due to external loads/drops.
etc.
See also:
Linux disk test for errors and broken sectors