No Writable WD Smaqrtware Partition Found

I am running Windows 7 Professional 64 bit and had the same problem . Set up MYBOOK Live no problems started Backup and it worked well until I updated Smartware. Then received the No Writable Partition message. I did not immediately recognise that the update was the problem. Reinstalled Smartware from and continued to have the problem. The problem was that downloading from the website provided the updated software Version 1.6.4 something ( I think). Finally uninstalled Smartware and reinstalled from the CD which came with MYBOOK and did not update when asked to do so. It is now working fine on Smartware Version

I hope this helps

Weird, do you have the latest firmware version installed for the my book.