No Writable WD Smartware partition found

I have installed ths drive twice - and I still can’t back up all my pictures. It keeps saying no writable WD Smartware partition found. Why is that so? I am using a mac. and I already read and followed all the instructions. What is wrong? How do I simply upload my things? 

That sounds like you have not formatted the hard drive for mac. Check the link bellow.  Backup any files that you might have inside the external hard drive first.

I have just brought a WD and Im having trouble   - No writable  WD smartware partition found I have a DELL computer windows 7