Parameter value | Description |
Read Error Rate | Shows the frequency of errors during disk read operations. |
Spin Up Time | Shows the average disk spin-up time from 0 RPM to working speed. |
Start/Stop Count | Shows the total number of times a drive has been turned on and off. |
Reallocated Sectors Count | Shows the number of reallocated sectors. A sector is marked as reallocated when a read, write or verification error occurs on the disk. The data is moved to a special backup (spare area). When a large number of sectors are reallocated, the data reading speed drops sharply (up to 10% or more). |
Seek Error Rate | Determines the rate of seek errors of the magnetic heads. Seek errors will arise there if is a partial failure in the mechanical positioning system, damage to a servo, or thermal widening of the hard disk. |
Power-On Hours | Shows the count of hours in power-on state. |
Spin-Up Retry Count | Shows the number of attempts to reach the fully operational disk spin speed. |
Power Cycle Count | Shows the count of full hard disk power on/off cycles. |
End-to-End Error | Shows a count of errors that occurred when transferring data via the drive's cache. |
Reported Uncorrected Errors | Shows the count of sectors that were declared as unstable for reallocation for the whole history of the drive. If a sector is declared a unstable for a second time, the value of the attribute will also increase. |
Command Timeout | Shows the count of operations that were canceled because their execution time exceeded the drive timeout period. |
Temperature | Shows the current disk temperature. |
Hardware EСС Recovered | Shows the count of errors that were corrected using ECC (Error Correction Code). |
Reallocation Event Count | Shows the number of sector reallocation events. |
Current Pending Sector Count | Shows the number of unstable sectors for reallocation to the disk’s spare area. |
Uncorrectable Sector Count | Shows the number of unstable sectors detected when testing the disk offline. |
Disk Shift | Shows the distance the disk has shifted relative to the spindle. |
Percentage Lifetime Remaining | Shows the percentage of time remaining in which the disk will be in working condition. |
Media Wearout Indicator | Shows remaining flash memory life (on an SSD). |
Average Erase Cycle | Shows the average number of erase cycles. |
Host Writes | Shows the number of writes to the NAND memory (Not-And). |
Soft Read Error Rate | Shows the frequency of software read errors. |
Total Written | Shows the total volume of information on the disk. |
Total Read | Shows the total volume of information read from the disk. |
Max Erase Cycle | Shows the maximum possible number of disk erase cycles. |
Total Erase Cycle | Shows the total number of disk erase cycles. |
Available Spare | Shows the amount of spare memory remaining on the disk. |
Unknown | A parameter that could not be determined. |