Most modern Apple computers come with non-removable internal drives, because they are directly soldered to the motherboard. Hence, SMART Utility, a GUI tool for querying and verifying SMART (Self-Monitoring, Analysis, and Reporting Technology) data becomes very important, as its showing the number of hours, GB/s written to the drive, and it’s overall health. This is important because HDDs and SSDs have a limited amount of writes.
This application has free version available for free here.