After a storm, lost data on My book Home Mac Yosemite

Hello, as stated in the title my “My Book Home” disks mounted on the desktop without any data inside.
I have not done any action on these discs. What I suggest you do to regain their status before storm? Thank you all

Hi there and welcome to the WD community.

Have you tried connecting this drive to a different computer to see if the data is visible? Does the drive turn on ?

Thank you for your reply.

Connected to another Mac, no data is displayed on my drive. Yes, my disk mounted on my Macs except that its name has changed.
It also requires you to know that I am French and my English language is poor. This is the second time I plant my drives; the last time there were only 2 and had taken a month to recover some data and sort them. This time they are 3 drives which are down.

thank you again