Found this on the internet so i thought i would copy and paste it here for you all to read.
Update1 : A small update from C4eva:
[c4eva] forza 4 8.7Gb backup on a normal DL running fine on xbox live with 13604 dash with LT 2.0! more soon!
Also regarding the new update:
<@c4eva> nothing unusual, same checks!
What does it mean?
1. The new system update doesn’t contain anything unusual and is completely safe. Make sure your console has LT+ 1.9 or above before updating.
2. C4eva has created a new method that lets us burn 8.7GB data on a normal dual layer dvd. Previously we weren’t burning around 2-3% of the game data to discs and this way creating problems.
3. We might not need LT+ 2.01 as forza’s 8.7GB backup is working fine on LT+ 2.0.
PS. Not sure if this has been posted, if it has please close.