For your knowledge, most NAS devices, regarless of the brand, run some flavor of Linux. You will not be able to see partitions on Mac/Win machines just by plugging in the drive.
Read this guide, specially #1 and #2.
http://community.wd.com/t5/My-Book-Live/GUIDE-How-to-unbrick-a-totally-dead-MBL/td-p/435724