[CentOS] Can't mount FAT32 partition

Thank you for the advice.
I've tried:
/dev/hda                /mnt/windows            vfat    auto,rw,umask=0 0 0
...and:
/dev/hda1               /mnt/windows            vfat    auto,rw,umask=0 0 0
... in my /etc/fstab file, and I still get this error:
mount: wrong fs type, bad option, bad superblock on /dev/hda1,
       or too many mounted file systems

Is there any other possible cause?

Dave