Hmmm, lets expound on this..
master server. no multiplexing
2 redo logs
1 control file
scenario 1
check point occurs.. (why is irrelevant)
BOOM! ORA-01578: ORACLE data block corrupted (file # 347, block # 13591)
it just so happens that your redo log resides on the same disk that just blew up or maybe your control file.

scenario 2
cd /oradata/prod_database/
rm *.log
oops!