Apple TV with ATVflash, do I need my internal HDD?

Hi

I have an Apple TV and have ATVflash so I can stream direct wirelessly from my NAS, this works fine for me.

So my question is, because of this I haven’t even used my internal Apple TV HDD, what do people use there internal HDD for if they have ATVflash please?

Any ideas? it seems a waste to have 160Gb just doing nothing!

cheers

iTunes sync I guess…

I only got the 40GB version for this reason.