I have four 850 EVO 1TB SSDs configured in a RAID 10 array using IRST on an ASUS Prime Z370-P motherboard. They have worked great for two years. Now one of the SSDs is being set to SATA transfer rate of 3 Gb/s (it originally was set to 6 Gb/s [the other three still are]) which is slowing down the array. How can I troubleshoot this? Thanks.
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