USB booting :: Removing 2 DSL partitions from USB Key?

Hi everyone,

I have a 1GB usb key upon which I installed DSL on several months
ago.  Since that time I installed it on another USB key.

Now I want to use my original USB key, but without DSL
(and its 2 partitions) on it.

What are the linux commands to :

1) delete the 2 partitions off of my USB key
2) create a single partition again
3) and format that single partition for
   use in linux and windows ?


Any help would be greatly appreciated.