Does Checkmate work with El Capitán?
Yes, because Checkmate only
TESTS the volumes/drives whereas Diskwarrior, Drive Genius, and TechTool Pro not only test the volumes/drives, they attempt to
REPAIR any damage or modify system settings. Apple sometimes deletes, replaces, or modifies Unix commands that third party applications are relying on to perform some repair/maintenance activities or adds functions to the HFS+ (Apple OS Extended) file system. So utilities that are unaware of those changes and attempt to make repairs or modify settings risk fatally damaging the system and/or drive volume structure.
By the way I am now running an OWC Thunderbay mini RAID 5 array and somewhat to my surprise Checkmate successfully performs surface scans, verifies the partition map,
and gathers SMART data on each of the four drives in the RAID array. However it does not attempt a volume structure check of the RAID array. Apparently the Thunderbolt bus does not have the same limitations preventing SMART that USB and firewire do. As with the fusion drive each drive is tested individually and not the combined logical volume.
