yum install smartmontools
Information about the /dev/sda disk
sudo smartctl -i /dev/sda
full article here
| № | Hex | Attribute Name | Lower is better if… | Description |
|---|---|---|---|---|
| 01 | 01 | Raw Read Error Rate |
 |
The frequency of data read errors originating from the disk's hardware. For all Seagate, Samsung (F1 family and newer), and 2.5″ Fujitsu drives, this is the number of internal data corrections performed beforedata is sent to the interface, so you can calmly ignore seemingly huge numbers[2][3]. |
| 02 | 02 | Throughput Performance |
 |
Overall disk performance. If the attribute value decreases, there is a high probability of disk problems. |
| 03 | 03 | Spin-Up Time |
|
The time it takes for the disk platters to spin up from idle to operating speed. It increases due to mechanical wear (increased bearing friction, etc.) and may also indicate poor power supply (e.g., voltage drop during disk startup). |
| 04 | 04 | Start/Stop Count | Total number of spindle start-stop cycles. For some manufacturers' drives (e.g., Seagate), this is a counter for entering power-saving mode. The raw value field stores the total number of disk starts/stops. | |
| 05 | 05 | Reallocated Sectors Count |
|
Number of sector reallocation operations. When a disk detects a read/write error, it marks the sector as "reallocated" and moves the data to a dedicated reserve area. This is why you cannot see bad blocks on modern hard drives – they are all hidden in reallocated sectors. This process is called remapping, and a reallocated sector is called a remap. The higher the value, the worse the disk surface condition. The raw value field contains the total number of reallocated sectors. An increase in this attribute's value may indicate deterioration of the disk platter surface. |
| 06 | 06 | Read Channel Margin | Read channel margin. The purpose of this attribute is undocumented. It is not used in modern drives. | |
| 07 | 07 | Seek Error Rate |
|
Frequency of errors during magnetic head block positioning. The more errors, the worse the mechanical condition and/or the hard disk surface. The parameter value can also be affected by overheating and external vibrations (e.g., from adjacent drives in the cage). |
| 08 | 08 | Seek Time Performance |
|
Average performance of magnetic head positioning operations. If the attribute value decreases (slower positioning), there is a high probability of problems with the drive's mechanical head assembly. |
| 09 | 09 | Power-on Time Count (Power-On Hours) |
|
Number of hours (minutes, seconds – depending on the manufacturer) spent in the powered-on state. The threshold value for this attribute is typically the rated Mean Time Between Failures (MTBF). |
| 10 | 0A | Spin-Up Retry Count |
|
Number of retry attempts to spin up the disks to operating speed if the first attempt failed. If the attribute value increases, there is a high probability of mechanical issues. |
| 11 | 0B | Recalibration Retries |
|
Number of recalibration request retries if the first attempt failed. If the attribute value increases, there is a high probability of mechanical issues. |
| 12 | 0C | Device Power Cycle Count | Number of full power-on/power-off cycles of the drive. | |
| 13 | 0D | Soft Read Error Rate |
|
Number of read errors caused by software that could not be corrected. All errors are non-mechanical in nature and indicate only incorrect disk partitioning/interaction by programs or the operating system. |
| 184 | B8 | End-to-End error |
|
This attribute is part of the HP SMART IV technology – it indicates that data parity between the host and the hard disk does not match after data transfer through cache memory. |
| 187 | BB | Reported UNC Errors |
|
Errors that could not be recovered using hardware error correction methods. |
| 188 | BC | Command Timeout |
|
Number of operations interrupted due to HDD timeout. Usually, this attribute value should be zero, and if the value is significantly higher than zero, there are likely serious power issues or oxidized data cables. |
| 190 | BE | Airflow Temperature (WDC) |
|
Air temperature inside the hard drive enclosure. For Seagate drives, it is calculated as (100 – HDA temperature). For Western Digital drives, it is (125 – HDA). |
| 191 | BF | G-sense error rate |
|
Number of errors resulting from shock loads. The attribute stores readings from the built-in accelerometer, which records all impacts, bumps, drops, and even careless installation of the drive into the computer case. |
| 192 | C0 | Power-off retract count |
|
Number of power-off or emergency failure cycles (drive power on/off). |
| 193 | C1 | Load/Unload Cycle |
|
Number of cycles moving the magnetic head block to the parking zone / to the operating position. |
| 194 | C2 | HDA temperature |
|
This stores readings from the built-in temperature sensor for the mechanical part of the drive – the Head Disk Assembly (HDA). Information is taken from the built-in temperature sensor, which is one of the magnetic heads, usually the bottom one in the assembly. The attribute's bit fields record the current, minimum, and maximum temperatures. Not all SMART-compatible programs correctly parse these fields, so their readings should be treated with skepticism. |
| 195 | C3 | Hardware ECC Recovered |
|
Number of errors corrected by the disk's hardware (reading, positioning, transmission via external interface). On drives with SATA interface, the value often worsens with increased system bus frequency – SATA is very sensitive to overclocking. |
| 196 | C4 | Reallocation Event Count |
|
Number of reallocation operations. The attribute's "raw value" field stores the total number of attempts to move information from reallocated sectors to the reserve area. Both successful and unsuccessful attempts are counted. |
| 197 | C5 | Current Pending Sector Count |
|
Number of sectors that are candidates for replacement. They have not yet been identified as bad, but reading from them differs from reading a stable sector; these are so-called suspicious or unstable sectors. If the sector is successfully read subsequently, it is excluded from the candidate list. If read errors persist, the drive attempts to recover it and performs a reallocation (remapping) operation. An increase in this attribute's value may indicate physical degradation of the hard drive. |
| 198 | C6 | Uncorrectable Sector Count |
|
Number of uncorrectable (by the drive) sectors. If the number of errors increases, there is a high probability of critical surface defects and/or drive mechanical issues. |
| 199 | C7 | UltraDMA CRC Error Count |
|
Number of errors occurring during data transmission via the external interface in UltraDMA mode (packet integrity violations, etc.). An increase in this attribute indicates a poor (crumpled, twisted) cable and poor contacts. Such errors also occur during PCI bus overclocking, power supply failures, strong electromagnetic interference, and sometimes due to driver issues. The cause may be a low-quality ribbon cable. To fix this, try using a SATA ribbon cable without latches, which has a tight connection with the drive contacts. |
| 200 | C8 | Write Error Rate / Multi-Zone Error Rate |
|
Shows the total number of errors occurring during sector writing. Shows the total number of write errors on the disk. It can serve as an indicator of the drive's surface quality and mechanical condition. |
| 201 | C9 | Soft read error rate |
|
Frequency of "software" errors when reading data from the disk. This parameter shows the frequency of errors during read operations from the disk surface due to software, not the drive's hardware. |
| 202 | CA | Data Address Mark errors |
|
Number of Data Address Mark (DAM) errors (or) vendor-specific. |
| 203 | CB | Run out cancel |
|
Number of ECC errors. |
| 204 | CC | Soft ECC correction |
|
Number of ECC errors corrected via software. |
| 205 | CD | Thermal asperity rate (TAR) |
|
Number of thermal asperity errors. |
| 206 | CE | Flying height | Height between the head and the disk surface. | |
| 207 | CF | Spin high current |
|
Current magnitude during disk spin-up. |
| 208 | D0 | Spin buzz | Number of buzz routines to spin up the drive. | |
| 209 | D1 | Offline seek performance | Seek performance during offline operations (Drive’s seek performance during offline operations.) | |
| 220 | DC | Disk Shift |
|
Distance of the disk block shift relative to the spindle. It mainly occurs due to impact or dropping. The unit of measurement is unknown. If the attribute increases, the drive quickly becomes inoperable. |
| 221 | DD | G-Sense Error Rate |
|
Number of errors caused by external loads and impacts. The attribute stores readings from the built-in shock sensor. |
| 222 | DE | Loaded Hours | Time spent by the magnetic head block between unloading from the parking area to the disk's operating area and loading the block back into the parking area. | |
| 223 | DF | Load/Unload Retry Count | Number of new attempts to unload/load the magnetic head block into/from the parking area after a failed attempt. | |
| 224 | E0 | Load Friction |
|
Magnitude of friction force of the magnetic head block when unloading from the parking area. |
| 225 | E1 | Load Cycle Count |
|
Number of cycles moving the magnetic head block to the parking area. |
| 226 | E2 | Load 'In'-time | Time it takes for the drive to unload the magnetic heads from the parking area to the disk's operating surface. | |
| 227 | E3 | Torque Amplification Count |
|
Number of attempts to compensate for torque. |
| 228 | E4 | Power-Off Retract Cycle |
|
Number of automatic parking retries of the magnetic head block due to power loss. |
| 230 | E6 | GMR Head Amplitude | Amplitude of "jitter" (distance of repeated movement of the magnetic head block). | |
| 231 | E7 | Temperature |
|
Hard drive temperature. |
| 234 | Number of uncorrectable ECC errors |
|
||
| 240 | F0 | Head flying hours | Total time the head block spent in the operating position in hours. | |
| 241 | Total LBAs Written | LBA writes | ||
| 242 | Total LBAs Read | LBA reads | ||
| 250 | FA | Read error retry rate |
|
Number of errors during hard drive reading. |
| 254 | Free Fall Protection | Drop protection |