"unable to read the disc", even though it worked yesterday!

[megadeoxys]

My wi decided to annoy me again, and rock band 2 disc cannot be read.
it worked just fine for the last couple of days, but now it just wont work.
i have some dlc on my sd card. any ideas why wont it work?

[Z-Diddy]

I just posted in another thread on the same issue-- did you get the message concerning there being a corrupt file and asking if you want to overwrite? I am so unhappy.