The default Google Drive client is pretty basic and limited to one account at a time. Google probably has not prioritized desktop software like Drive. There are

The default Google Drive client is pretty basic and limited to one account at a time. Google probably has not prioritized desktop software like Drive. There are third party clients that provide more features like Syncdocs http://syncdocs.com http://syncdocs.com which can sync multiple @gmail accounts to Google Drive. >Why, Google, why? Google probably prefers you to keep one account for targeting advertising, plus each Drive account comes with 15GB free space, so multiple Drive accounts give you more free space.