Some users may want to locate the
tablespace files in a location other than the MySQL server
data directory. Placing the tablespace files in a separate
location can be desirable if your system has available a
storage device availablehas with higher capacity or higher
performance, such as a RAID storage system.
To change the default location for the
InnoDB tablespace files, choose a new drive
from the drop-down list of drive letters and choose a new path
from the drop-down list of paths. To create a custom path,
click the ... button.
If you are modifying the configuration of an existing server, you must click the Modify button before you change the path. In this situation you must move existing tablespace files to the new location manually before starting the server.