click-click in floppy disk drive

[leeoliveshackelford at surewest.net]

Good afternoon, dear FreeBSD enthusiast.  I have recently installed FreeBSD 9.1 on my Hewlett-Packard Z220 workstation.  I added a Sabrent u.s.b. floppy drive.  Two days ago, I ran the "periodic" program.  Ever since then, the floppy drive clicks once every 2 seconds, followed by a double blink of the hard drive light.  The is no disk in the floppy drive.  Does anyone know how to stop this annoyance?  If so, please let me know.  Thank you.  Newby Lee