So this is an intermittent but complete pain in the ass-- My D drive, which is an internal RAID 5 array of 4 HDD drives, will sometimes drop out/disappear in Windows 10 when I am doing data/drive-intensive tasks like exporting large images. It's necessary to reboot in order for the D drive to be recognized again by Windows. How can I troubleshoot this? It's seriously annoying. Thanks.