|To read a floppy disk you need a floppy drive. I've never seen a card reader with a floppy drive but if one exists then yes, you could use it as long as the PC saw it as a floppy drive. If you mean an external floppy drive, yes that would work too.|
If it's just showing gibberish then it's either corrupted or has a non-traditional format.
Is it a 720 K or 1.4 meg disk?