A low number indicates a high probability of future failure. The higher is the number, the better is the performance of a data storage device in this particular characteristic. Performance assessments typically are in the range from 0 to 100.
device current status (the number of errors and the time of searching for a track, the elevation of heads above the drive, the total number of active sectors). signs of storage device normal wearing (the number of cycles, heads movements, spindle hub rotations). Analysis of collected data and evaluation of each characteristic in two groups takes place inside the system every second: SMART monitors the performance of a hard drive in real time. This hardware-software set predicts the time of HDD wearing and records several other important characteristics regarding storage device performance and hard disk errors. 
SMART is a tool for assessing hard drive current state, i.e. HDD Health - SMART check software for Windows.
Hitachi Drive Fitness Test - HDD SMART monitoring tool for AHCI/IDE/USB.Utilities for reading SMART data on Windows.
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