iTunes HELP! Troubles downloading iOS firmware

Hello everyone

Today i decided to restore my iPod touch 5th generation, which was in DFU. While i was downloading the iPod firmware (1.3GB) suddenly the wifi stopped and itunes said that there was an error and so restarted the download from the beginning.

The problem is that i cannot find out where the file wich I was downloading at the beginning is, considering that i was almost at the end of the download and Idon't want to have more that 1GB corrupted fiel on my hard disk.

Can anyone tell me how to find out where it is and delete it?

Thanks

Stefano