Post-Maverick upgrade, now my firewire MyBook does not mount

This external firewire MyBook worked fine and continues to work fine if I boot up Snow Leopard.  However, if I boot up into Mavericks then the MyBook will not mount nor become visible in Disk Utility.  I am not running nor have ever run any WD software and so it is not related to that issue.


Mavericks caution, upgrade your WD Drive Manager to the latest version available.

I hope that is only formatting issue … and that is not an old version of WD drive manager have deleted your data :cry:

in case of problems on mac OS format (when Disk Utility does not work properly), can be solved using DiskWarrior.