WD cannot be read by computer (mac)

Hi,

i have recently bought my WD 1TB 2.5" essential and suddenly just today i tried to connect it to my computer and it shows this error message that it cannot be read. i tried all my knowledge to get it back but it doesn;t seem to work nad all my data is stuck there. Please assist. Greatly appreciated. 

Using: a mac book pro 13" 

Regards:

Don Oei

Does the drive show in Disk Utilities?