Icon wont pop up on my screen

my WD 1tb external hard drive icon wont pop up on my MAC. the light turns on and i can hear it working but it does not show an icon on my screen. I really need all the data on my external. can anyone please give me some guidance with this issue

Check if the drive appears on Disk Utility.

How to access Disk Utility on a Mac computer

http://wdc.custhelp.com/app/answers/detail/a_id/1362