My Book External - Recovering Data

While instaling a new internal WD hard drive and going thru the setup, I got the prompt to use/delete partitions. By mistake I delete the partition on my WD External drive. Is there a way to recover this data? Every time I try to access the external drive is asking me is I want to setup the drive. I was using the external drive as a daat drive not as a backup. Any ideas?  Thank you!

Hello and welcome to the WD community.

I would recommend trying a Data recovery software on the drive since it is still showing on the computer, you can also see if you can take the drive to a data recovery company, here are some of the WD partners that offer in some cases a free diagnostic on your drive: 

http://support.wdc.com/recovery/index.asp?wdc_lang=en

Lets also see if another user can share some tips and information on this matter.