My cache handler in Joomla! only shows 'memcached (experimental)', and not File etc. I was able to change the cache handler in my configuration.php but I'd still like to know why File is not shown as a cache handler option? How can I fix it? I checked folder rights already.
Create a folder called "Cache" to the root of your website (or to the directory where you have installed Joomla) and apply 755 permission to it. Then disable cache plugin, and you should be able to select "File" as Cache handler.
Hope it helps
PS: To remove "memcached" you can delete all the lines including "memcached" from your configuration.php file (remember to set 644 and when you finish editing back to 444)