HD Install :: partition mounting problems

I used cfdisk to put partitions on my hd. I successfully installed DSL thanks to help from these forums. Now DSL boots from the hd, but I cannot mount other partitions.

/dev/hda1 is the bootable partition DSL is on.
/dev/hda2 is extended with
/dev/hda5 type 83
/dev/hda6 type 82
/dev/hda7 type 83

mount -t ext2 /dev/hda5 /mnt/hda5

generates this error

wrong fs type, bad option, bad superblock on /dev/hda5

Do I have to delete and recreate these partitions now that I have DSL installed?

TIA,

Dave

Did you format them? As root do the following:
mke2fs /dev/hda5
mke2fs /dev/hda7
mkswap /dev/hda6

original here.