Hello there !

Currently I'm running a smaba on slackware 13.1 with a 1TB Hard drive for dumpng files rather than sharing. My partition table is as follows:
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/dev/sdb2 swap swap defaults 0 0
/dev/sdb1 / ext4 defaults 1 1
/dev/sdb3 /home ext4 defaults 1 2
#/dev/cdrom /mnt/cdrom auto noauto,owner,ro 0 0
/dev/fd0 /mnt/floppy auto noauto,owner 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
proc /proc proc defaults 0 0
tmpfs /dev/shm tmpfs defaults 0 0
######################################################################

Now that i need to add 2 more 1TB hard drives and I want to stripe these two drives to make one partition for large space. Can anyone help me doing it plzzzz??????
I'm in badly need of doing it......

You're looking to set up a Logical Volume. Start here. I believe this can also be done with RAID, but I have no experience with it.

You can use RAID0 for this but you're much more at risk of data loss, I don't recommend it.

Plug in disks 2 & 3. They will be /dev/sdc and /dev/sdd. Follow the link above to create a volume group containing both new disks as physical volumes. Then create a single logical volume across all available space. Format it as XFS unless you want to lose a lot of space.