Xbox 360 unformatted disk

Typically a corrupt hard drive can be caused by turning off your system when things are saving or while updating that fan potentially be dangerous or for some reason if it was damaged

Hi Mr,

Thanks for the update on your issue. If the disk is reading unformatted, then it will need to be formatted. The content on the HD is basically already gone. This is due to somehow the HD has become corrupt. SO in order to get it working correctly, you will
need to format the drive again. If all the data is gone, we recommend to
enable cloud saves.

Hope this helps.

Brad

Here's a link for common 360 Hard Drive issues, I hope it's of some help.
Troubleshoot Xbox 360 Hard Drives

Hi Mr,

Thanks for replying. Something has corrupted the HD totally for it to read unformatted. The only way to get the HD to read is to reformat. If the cloud saves were not enabled all save data is stored on the HD. So in this case all progress would
be lost. Your games stay with your profile. This is the only bad thing about the Xbox 360. As cloud was not big when it came out. It could be more than the update that caused this.

Thanks,

Brad

Try replugg it in. If you need to reformat it all you online contact is saved on that account