Restore from a clean backup. That's not repairable.
If you have an unbroken log chain from the clean backup then you won't lose any data (you can take a tail-log backup before starting the restore)
Edit: Oh, and have a very good look at that IO subsystem. Databases don't corrupt themselves, that looks like a section of the disk has been zeroed out. Misbehaving IO subsystem.
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability