Western Digital Passport Drive Shows up on Old 2009 MacBook Pro, but not my new one
Are both MacBooks running the same version of Mavericks? WD had a fiasco with their applications, kernel extensions, etc. being incompatible with Mavericks, which led to massive customer data loss. You might need to update the drive's firmware and erase every trace of WD SmartWare, etc. on the drive and possibly even on the new MacBook, as their crapware can self-install in some instances.