how can put the data directory out side the ":C" drive like D or E partition and how can they communicate the data with moodle application
You can put the moodledata directory wherever you like. Just put the full path in the $CFG->dataroot setting in config.php. If you have already installed Moodle, you can just move/copy the folder and change the above setting.
Thank you Howard Miller..... i got the point but since i am new to moodle i need help from you how to call the folder being from specific course in a moodle site admin....... thank you in advance
Sorry - I don't understand what you are asking Specific courses do not have folders in Moodledata.