I have an iMac and a 12-inch MacBook. I also have an external hard drive.
The hard drive won't mount on either machine. I can't see it in finder or in disk utility. The weird thing is that I can feel the drive spinning. I don't believe that it's ever been dropped or damaged, and it's designed specifically to withstand abuse.
When I asked Google this question, every answer was about sending it to a data recovery place, but I've duplicated this drive in a partition on my 3TB drive, so the data isn't important. Is there any way to simply wipe this drive clean and start over?