I have an HDD hard drive attached to my 360 but after four years the memory has reached the brim. There's only something like 400 MB left on it, not even enough for a small DLC. In the past, I was able to trim fat and clear up space, but it eventually whittled down to only clearing a few MB at a time. Now there is literally nothing I can delete, it's all game progress, saves, and DLCs. The stuff I have left to delete are just small things like gamerpics, but those take up such a small amount of memory (maybe a total of 5 MB or something) deleting them is fruitless.
I stuck a 4GB USB drive in as an act of desperation, but that filled up in a single day.
Is there anything I can do? There's no way I'm going to be able to play new games and DLCs in the future.