Season Pass using 30Gb+ HD Space to install

I keep trying to Jailbreak my Apple TV (2nd gen.) and upon doing so, I am consistently getting the screen that says “Restoring in iTunes. Please wait while script is running…” While this is going on, my HD capacity slowly decreases from ~31Gb down to roughly 400mb before I get a message that there is no more HD space or memory to complete the task. When I restart my computer, the HD available space returns to ~31Gb. I have tried this multiple times with the same result each time. What should I do?