To uncompress a 16GB flash drive? It's not something I've done before.

I bought it as 16GB, but I know it's probably 4GB tops which is more than I currently need anyway. Hopefully I will buy a decent flash drive if and when I dispute to PayPal (currently giving the seller a few days to respond), yesterday I bought a 1GB Maxell at the supermarket for £4 (ASDA) and it's doing a pretty good job with the few Nat Geographic docu's I've watched on my Wii.