[quote]wind guess[/quote]

lol I'm retarded

[quote=Halo]
Not that we know of. It was working completely fine, never had any issues with it ever, and this time we just booted it up, tried to download a compulsory system update, and it said we had no space on the harddrive. We knew this was bullshit, so rebooted the Xbox. It took us to the initial settings screen, from the first time you turn it on, and when we got through that we checked the harddrive under the system settings and it said it was unformatted, and we could do nothing with it until it was formatted. As this is one of the models with an internal HDD, we had no choice but to format it.
[/quote]

Secondary guesses: 
-You fucked it up the previous save you made and didn't know it
-The update literally fucked you
-The update was little fucky and you turned your xbox off when it was still trying to do something on your HDD