You might want to try adding the same lines with /dev/sda2 and /dev/sdc2. This is just in case you already have another device using up the first 2 or the more likely case you don't have one using /dev/sda2 already. The first line below is all I have and things are fine for me. The next 2 are just to try out. It takes a few seconds for hotplug to pick up the device once it is plugged in.
/dev/sda2 /mnt/ipod vfat noauto,user,rw,suid,exec 0 0
/dev/sdb2 /mnt/ipod vfat noauto,user,rw,suid,exec 0 0
/dev/sdc2 /mnt/ipod vfat noauto,user,rw,suid,exec 0 0
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