Passport won’t mount - is all data deleted?

I upgraded to a larger WD drive about a year ago and, while doing some cleaning, I realized that I still have my old drive sitting around. I want to get rid of if, however I figured that I ought to clear it off first. However the drive won’t mount on my computer. The light still comes on the drive when it’s plugged in, though. Does this mean that my data has been deleted and the drive is okay to get rid of? Or is there any other way to see what’s on there / clear it?

Use a hammer to smash it or get a strong magnetic to wipe it out.