I'm getting this error dialog every time I start the game. Interestingly, no matter which of the 3 available buttons I press on the dialog, even Cancel, the dialog closes, and the game proceeds normally!! Why is this occurring?

BTW, my game is installed on drive F:, not G:

My system:
Windows 7 64 bit
NVidia GTX 980, current drivers
Installed on F:, Samsung 950 Pro SSD
G: is a flash-card reader with nothing inserted in it.

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I just updated Witcher 3 to V1.22, and now it says:

There is no disk in the drive. Please insert a disk into drive \Device\Harddisk3\DR3

but otherwise still works the same.

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Later note:
After reading another post on this topic, elsewhere on this forum, I found the solution!!!
The program is looking at *all* available disk drives, and for some reason is displaying error dialogs for disks that have no media in them - as is common for DVD/CD and FLASH drives... it's completely meaningless...

In my case, I put a blank SD card in my FLASH reader, and both of these messages disappeared !! duh...