Yes and then you'd have to write an OSX driver for it. And Mini vMac would have to have the ability to access it, something Paul Pratt has not been interested in developing.
And don't forget Snow Leopard dropped support to write to HFS disks.
However, this topic has been discussed at length on this forum. There are ways to mount a USB floppy drive under SheepShaver and work within a native environment.
But the question I really have is why wouldn't you just copy your files on your old Mac? Make your disk images on the native Mac as well?