[+/-] Xbox 360 file system cracked

Well that didn't take long:

The Xbox 360's DVD file system has been exposed, a coding group calling itself Pi, has claimed.... [I]t is likely to provide the foundation for work seeking to attack the content protection put in place by Microsoft.

According to the Pi people, the Xbox 360's file-system is essentially the same as the one employed by its predecessor console: "Once you get past the protections and down to the raw bits on the disc, its just the standard xboxdvdfs, however the offset and layer breakpoint are different."