From OpenSCADAWiki
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| Disk SMART (hddsmart)
"DiskSMART{DEV}" || Devices DEV of disks, available in the system. || Defined by SMART-fields, available for this disk. For each field the unique attribute is created. || That is the slow source. The source is dynamic, so the available attributes dependent from the disk type. The smartctl program must be installed and available.