floppy disk caching

I have a computer that caches the info from a floppy and will not let go. I.e. – put a floppy in the drive, click on it to show the contents, remove the floppy, do a refresh, and the same data still shows for the A: drive. If a different floppy is put in the drive, it will show the info from the first floppy. How to get the a: drive to refresh and release the data from the first disk.

Thanks