Did you format it for macs partition?i would google search how to partition external drive for mac and partition it if you haven't done so just make sure you're checking for your OS you're using as some mac os systems are different from others
The drive was working and I had it installed! I use it as data archive since 3 years! I have important data for my work on it! Now with the update it is not possible to connect any longer! I hope you can understand that I can not format it since I would loose all the data! When I bought it, I thought I had invested into a reliable solution to store my data!!!! Obviously it is not!!!!