14.2.1.4 Dealing with InnoDB Initialization Problems

If InnoDB prints an operating system error during a file operation, usually the problem has one of the following causes:

If something goes wrong when InnoDB attempts to initialize its tablespace or its log files, delete all files created by InnoDB. This means all ibdata files and all ib_logfile files. In case you have already created some InnoDB tables, delete the corresponding .frm files for these tables (and any .ibd files if you are using multiple tablespaces) from the MySQL database directories as well. Then you can try the InnoDB database creation again. It is best to start the MySQL server from a command prompt so that you see what is happening.