S.M.A.R.T. (Self-Monitoring, Analysis and Reporting Technology) is a monitoring system for hard drives to detect and report on various indicators of reliability to anticipate drive failures. Although an industry standard exists among most major hard drive manufacturers, not all manufacturers are willing to share the details of their hard drive designs due to proprietary concerns. Therefore, the S.M.A.R.T feature may not truly reflect the status of individual hard drives.
This situation is even more difficult with solid state drives (SSD). Due to the fact that SSD manufacturers use NAND flash chips and controllers from different sources and have various firmware designs, it is common for different SSDs to have different S.M.A.R.T. definitions. Therefore, it is possible that Synology Storage Manager’s S.M.A.R.T. Test feature may not correctly detect or even run smoothly to report the health status of installed SSDs. To obtain more accurate results on your SSD health status, we recommend using your SSD manufacturer’s S.M.A.R.T. Test utilities.