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The intent of unchecking the "Show SSD Drives" box is to hide SSD drives from view, presumably to eliminate the possibility of selecting them for defraging. However, unchecking this box only hides the first partition on an SSD drive. Other partitions on the SSD drive are still visible in the drive list. In the Attached jpg my Local Disk (D:) drive a partition on an SSD. Also, my Local Disk (Y:) drive is a HDD, but it is identified with "SSD Detected" in the Status column.