mysql安装完后，我修改了数据库保存路劲后，启动不了。

111219 11:02:42 [Note] Plugin 'FEDERATED' is disabled.
111219 11:02:42 [Note] Plugin 'InnoDB' is disabled.
D:\Server_Core\MySql\bin\mysqld: Table 'mysql.plugin' doesn't exist
111219 11:02:42 [ERROR] Can't open the mysql.plugin table. Please run mysql_upgrade to create it.
111219 11:02:42 [ERROR] Fatal error: Can't open and lock privilege tables: Table 'mysql.host' doesn't exist

mysql安装完后，我修改了数据库保存路劲后，启动不了。
以上是出错提示。求教!

你是如何修改的？ my.ini 文件中的参数是如何配置的？