Solution. #3. I have tried uninstalling the Standard AHCI ATA Controllers in device manager and rebooting the system to no effect. I wouldn't do this, AHCI is what is used for SATA drives. You have a Toshiba X300 (5TB HDD) Sata drive and a WD Blue (1 TB HDD). You may or may not run into issues with these devices too. More @Wikipedia
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