If running Sea tools for windows and you have a card reader built in a USB drive not reported under Windows Disk Management or Explorer will be found.
You can even run a sea tools test although no media is inserted ?
These phantom drives are the USB Mass Storage Media Card ports permanently connected to your Generic USB Hub.
Un-associated USB Hub ports do not have assigned drive letters.
When a USB mass storage type device is inserted in an un-associated USB Hub port, Windows will:
1. Automatically assign the device the next available (unassigned) drive letter
2. Then reclaim the letter when the USB device is unplugged.