External hard drive formating error

When I plug my WD external drive into the laptop, I get: " Disk is not formated" message. Light is on, I can hear the drive.  I use the hard drive once every few months to back up all my data. Everything was fine a couple months ago when I last backed up. Is this a problm of HD and is the data recoverable?

Hello, it is probable that you have a data corruption problem, with the help of a data recovery program you should be able to recover most of your files, using Google you can find several options. You can also run a test with DLG to verify that the hard drive doesn’t have any hardware problems. Check the link below for the steps.

How to test a drive for problems using Data Lifeguard Diagnostics for Windows