Lexar 16GB S73 appears as Innostor NAND Flash USB Device
USB flash devices don't need drivers. I believe you might have removed one or both of these drives from the PC without using the proper procedure, and the PC (or notebook) is now "confused". Re-attach one or both devices, but this time, either use (Windows) Explorer to "electronicaly" eject the device (right click, then choose eject) or use "Safely Remove Device" shortcut, usually on the bottom right=hand corner of your screen (the taskbar).
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