SoftRAID for Mac only
SoftRAID reports the hours of use for all disks. For disks that support SMART, this value is the actual number of hours the disk has been turned on (either with the platters spinning or when they are stopped). We recommend that you replace disks with rotating platters after 20,000 hours of use as the incidence of failure can increases substantially after that point.
On disks that don’t support SMART, an “hours of use” counter is created the first time the disk is initialized with SoftRAID. This counter will continue to increase even if you later use SoftRAID to reinitialize the disk.