SMART attributes of Intel SSDs

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Intel SSDs provide a series of SMART attributes which give hints on the current health of the SSD. Each attribute has an absolute value (Raw), which is defined by the manufacturer and a normalized value (on a scale of 100 to 1 or 200 to 1).

The following table shows the meaning of all SMART attributes available for Intel SSDs (note that not every SSD provides all of these attributes). The source of this information is the help of the Intel Solid State Drive Toolbox version 3.0.2.

You find concrete example outputs of the SMART attributes ​​of Intel SSDs in the wiki articles of the Intel SSDs. The articles contain links to the respective Product Specifications, which provide more detailed information on the SMART attributes of each SSD.

SMART attributes

ID (hex) ID (dec) Beschreibung Raw-Wert (Absolutwert) Normalisierter Wert
03 3 Spin-Up Time For Intel SSDs, reports a fixed value of zero (0).

The average time it takes the spindle to spin up. (Since an SSD has no moving parts, this attribute reports a fixed Raw value of zero (0) and a fixed Normalized value of 100.)

04 4 Start/Stop Count For Intel SSDs, reports a fixed value of zero (0).

This type of event is not an issue for SSDs. However, hard disk drives can experience only a finite number of these events, and therefore, must be tracked.

05 5 Re-allocated Sector Count The raw value shows the number of retired blocks since leaving the factory (grown defect count).
09 9 Power-On Hours Count The raw value reports the cumulative number of power-on hours over the life of the device.

Note: The On/Off status of the Device Initiated Power Management (DIPM) feature affects the number of hours reported.

If DIPM is turned on, the recorded value does not include the time that the device is in a slumber state. If DIPM is turned off, the recorded value should match the clock time, as all three device states are counted: active, idle, and slumber.

0C 12 Power Cycle Count The raw value reports the cumulative number of power-cycle events (power on/off cycles) over the life of the device.
AA 170 Available Reserved Space Reports the number of reserve blocks remaining. The normalized value begins at 100 (64h), which corresponds to 100 percent availability of the reserved space. The threshold value for this attribute is 10 percent availability.
AB 171 Program Fail Count The raw value shows total count of program fails. The normalized value, beginning at 100, shows the percent remaining of allowable program fails.
AC 172 Erase Fail Count The raw value shows total count of erase fail. The normalized value, beginning at 100, shows the percent remaining of allowable erase fails.
B7 183 SATA Downshift Count The count of the number of times SATA interface selected lower signaling rate due to error.
B8 184 End-to-End Error Detection Count Reports number of errors encountered during Logical Block Address (LBA) tag checks within the SSD data path. The normalized value begins at 100 and decrements by 1 for each LBA tag mismatch detected. The threshold value is 90.
BB 187 Uncorrectable Error Count The raw value shows the count of errors that could not be recovered using Error Correction Code (ECC).
BE 190 Temperature - Airflow (Case) Reports the SSD case temperature in degree Celsius. The raw value is as follows:
  • Byte 0 = Current case temperature (°C)
  • Byte 2 = Recent minimum case temperature (°C)
  • Byte 3 = Recent maximum case temperature (°C)
The normalized value is 100. Case temperature is calculated based on an offset from internal temperature sensor.
C0 192 Unsafe Shutdown Count (Power-off Retract Count) The raw value reports the cumulative number of unsafe (unclean) shutdown events over the life of the device. An unsafe shutdown occurs whenever the device is powered off without STANDBY IMMEDIATE being the last command.
C2 194 Temperature - Device Internal Reports internal temperature of the SSD. Temperature reading is the value direct from the internal sensor. The raw value is the current temperature. The normalized value is the results equation min(150-current temp, 100).
C7 199 CRC Error Count The total number of encountered SATA interface Cyclic Redundancy Check (CRC) errors.
E1 225 Host Writes The raw value reports the total number of sectors written by the host system. The raw value increases by 1 for every 65,536 sectors written by the host.
E2 226 Timed Workload, Media Wear Measures the wear seen by the SSD (since reset of the Timed Workload Timer, attribute E4), as a percentage of the maximum rated cycles.
E3 227 Timed Workload, Host Read/Write Ratio The percentage of I/O operations that are read operations (since reset of the Timed Workload Timer, attribute E4).
E4 228 Timed Workload Timer Measures the elapsed time (number of minutes) since starting this workload timer.
E8 232 Available Reserved Space Reports the number of reserve blocks remaining. The normalized value begins at 100 (64h), which corresponds to 100 percent availability of the reserved space. The threshold value for this attribute is 10 percent availability.
E9 233 Media Wearout Indicator Reports the number of cycles the NAND media has undergone. The normalized value declines linearly from 100 to 1 as the average erase cycle count increases from 0 to the maximum rated cycles. Once the normalized value reaches 1, the number will not decrease, although it is likely that significant additional wear can be put on the device.
F1 241 Total LBAs Written Counts sectors written by the host.
F2 242 Total LBAs Read Counts sectors read by the host.

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