Self-Monitoring, Analysis and Reporting Technology is a system for monitoring and recognizing errors of storage media like Hard Disk Drives (HDDs) and Solid State Disks (SSD).

All HDDs and SSDs (refered to as HDD in the following) have SMART functionality while some external drive cases do NOT support reading SMART values from the HDD directly.

Since SMART is not a standardised procedure or well-defined value collection, these values differ greatly between manufacturers and might indicate death for some hard drives while others do not even show or update said values.