USB to SD or other card

[Spritzer]

First, please excuse me if this is in the wrong place.

I've seen devices that allow you to insert an SD card and use it as a USB thumb drive, but is there a device that does the opposite allowing me to use a usb drive in a card slot? Is this even feasible?

[djgizmo]

There are no current devices on the market that have those specifications....

REASON: There are so many different size slots that the usb device would be hard to market to fit each one and function properly.

is there a device that does the opposite allowing me to use a usb drive in a card slot?