Debian: Add HDD

I have an torrenting system where I just toss in obsolete items. The OS is Debian sarge. I am adding a 16GB harddrive soon. I am not new to linux but I have never added in hardware without doing a fresh install. However, the system is just how I want it so I don't want to format now.

Right now the system is just one 20GB partition for everything.

I want to add in this new drive as a slave IDE. How do I format it, get it to automount, etc?

If possible, can I merge this drive without using any RAID solution, I'd rather have a 36GB drive than a 20GB and 16GB partition. I just want to somehow have a large contigous space for torrents to save in during downloading.

>>6 is not funny.

>>1 unfortunately you can't merge them without at least complete backupping. you would have to set up a sw-raid, change 2,3 config files and restore the data (the whole root-directory)  with a linux-livecd on the raid. it wouldn't be that hard though. if you really want to do that we might help you.

it *might* work with something like unionfs, but it'll be more like an ugly hack.

i suggest just mounting the hdd somewhere.