Well, a simple Google of
USB 5.25"
The first hit
http://www.computing.net/answers/hardware/is-it-possible-a-usb-525-floppy/5…
is a guy who claims that he connects an external 5.25" floppy drive to a
USB to Serial adapter!
. . . and internal 5.25" floppy drive to a USB to IDE adapter!
. . . and XP "Doesn't need a driver"
WOW!
I'd like to see that!
I wonder if he powers it by jamming a USB cable into the mains receptacle?