I had installed Windows XP on hda1 and FC 3 on hda5 and hda 6.
Then I installed SuSE 9.0 on hda3 and hda4.
Now I boot with SuSE 9.0.
How to access the FC 3 partition?

My /etc/fstab is:
/dev/hda4 / ext3 defaults 1 1
/dev/hda5 /data1 auto noauto,user 0 0
/dev/hda3 swap swap pri=42 0 0
/dev/hda6 /fc3 ext3 noauto,user 0 0

# mount -a
# mount
/dev/hda4 on / type ext3 (rw)
proc on /proc type proc (rw)
devpts on /dev/pts type devpts (rw,mode=0620,gid=5)
tmpfs on /dev/shm type tmpfs (rw)
usbdevfs on /proc/bus/usb type usbdevfs (rw)

# ls /fc3
. ..

i.e. The FC 3 partition is not accessible.

The fc3 partition is set to 'noauto', that means it is not mounted automatically on bootup. You need to mount it manually (mount -t ext3 /dev/hda6 /fc3) or change 'noauto' to 'auto' in /etc/fstab.

EDIT: For manual mount a 'mount /dev/hda6' should be sufficient, since it is mentioned in fstab.

# mount -t ext3 /dev/hda6 /fc3
mount: wrong fs type, bad option, bad superblock on /dev/hda6,
or too many mounted file systems

Did you do any re-partitioning before you installed SUSE? Please post the output of 'fdisk -l', so we can have a look at yout partition table.

I re-partitioned hda1 with Partition Magic to allow hda3 and hda4 for SUSE.

# fdisk -l

Disk /dev/hda: 80.0 GB, 80000000000 bytes
255 heads, 63 sectors/track, 9726 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/hda1 * 1 3213 25808391 7 HPFS/NTFS
/dev/hda2 4519 9726 41833260 f Win95 Ext'd (LBA)
/dev/hda3 3214 3342 1036192+ 82 Linux swap
/dev/hda4 3343 4518 9446220 83 Linux
/dev/hda5 4519 4531 104391 83 Linux
/dev/hda6 4532 9726 41728806 8e Linux LVM

Partition table entries are not in disk order

The only thing that look a little suspicious is the partition type of hda6. It seems to be handled by LVM (Logical Volume Manager). Maybe you need to use LVM in SUSE also to access this partition. But I have no experience in that matter.