Here is the oputput of sudo mount -t vfat /dev/sda4 /mnt/zip:

mount: /dev/sda4 is not a valid block device

This is done with a data disc in. Do I have to anything special to try to open it or read the disc like open with or just click on the icon?

Part of my fstab:

/dev/sda4 /mnt/zip vfat defaults,noatuo,users,noatime,umask=000 0 0
/dev/cdrom /cdrom iso9660 defaults,ro,users,noexec,noauto 0 0
/dev/cdrom1 /cdrom1 iso9660 defaults,ro,users,noexec,noauto 0 0
/dev/dvd /dvd iso9660 defaults,ro,users,noexec,noauto 0 0
/dev/cdaudio /cdaudio iso9660 defaults,ro,users,noexec,noauto 0 0
#/dev/cdrom1 /mnt/auto/cdrom1 auto users,noauto,exec,ro 0 0
# Added by KNOPPIX - took out noauto after ntfs and added auto after exec and ro after exec
/dev/hda1 /mnt/hda1 ntfs users,exec,auto,umask=000,uid=knoppix,gid=knoppix 0 0
# Added by KNOPPIX
/dev/hda5 none swap defaults 0 0