No value for THRESH column

In my hard drive, I got no value for the THRESH column to all attributes
(it display three dashes "---" in the place of the corresponding value).

What does this mean? I found in nowhere anything like this.


This is part of the result of "smartctl -a /dev/ada0"

SMART Attributes Data Structure revision number: 10
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME          FLAG     VALUE WORST THRESH TYPE      UPDATED
 WHEN_FAILED RAW_VALUE
  1 Raw_Read_Error_Rate     0x010f   083   069   ---    Pre-fail  Always
    -       229851726
  3 Spin_Up_Time            0x0103   097   096   ---    Pre-fail  Always
    -       0
  4 Start_Stop_Count        0x0032   100   100   ---    Old_age   Always
    -       25
  5 Reallocated_Sector_Ct   0x0133   100   100   ---    Pre-fail  Always
    -       0
  7 Seek_Error_Rate         0x000f   078   060   ---    Pre-fail  Always
    -       64180793
  9 Power_On_Hours          0x0032   095   095   ---    Old_age   Always
    -       5228
 10 Spin_Retry_Count        0x0013   100   100   ---    Pre-fail  Always
    -       0
 12 Power_Cycle_Count       0x0032   100   100   ---    Old_age   Always
    -       24
184 End-to-End_Error        0x0032   100   100   ---    Old_age   Always
    -       0
187 Reported_Uncorrect      0x0032   100   100   ---    Old_age   Always
    -       0
188 Command_Timeout         0x0032   100   100   ---    Old_age   Always
    -       0
189 High_Fly_Writes         0x003a   100   100   ---    Old_age   Always
    -       0
190 Airflow_Temperature_Cel 0x0022   064   058   ---    Old_age   Always
    -       36 (Min/Max 33/42)
191 G-Sense_Error_Rate      0x0032   100   100   ---    Old_age   Always
    -       0
192 Power-Off_Retract_Count 0x0032   100   100   ---    Old_age   Always
    -       12
193 Load_Cycle_Count        0x0032   100   100   ---    Old_age   Always
    -       238
194 Temperature_Celsius     0x0022   036   042   ---    Old_age   Always
    -       36 (0 18 0 0 0)
195 Hardware_ECC_Recovered  0x001a   026   019   ---    Old_age   Always
    -       229851726
196 Reallocated_Event_Count 0x0032   000   000   ---    Old_age   Always
    -       36864
197 Current_Pending_Sector  0x0012   100   100   ---    Old_age   Always
    -       0
198 Offline_Uncorrectable   0x0010   100   100   ---    Old_age   Offline
   -       0
199 UDMA_CRC_Error_Count    0x003e   200   200   ---    Old_age   Always
    -       0
240 Head_Flying_Hours       0x0000   100   253   ---    Old_age   Offline
   -       5230 (68 224 0)
241 Total_LBAs_Written      0x0000   100   253   ---    Old_age   Offline
   -       8277357289
242 Total_LBAs_Read         0x0000   100   253   ---    Old_age   Offline
   -       27319763


Best regards,
---
Diego Queiroz

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