Have you tried these steps?
How do I reset my Seagate?
Reset using the Seagate Central Assistant
Log in with your credentials.
Select the Settings tab.
Select the Restore button. This will restore the device settings to default values.
Proceed with initial setup.
I copied everything from my Seagate Central to another external drive, before leaving for a trip. I wanted redundancy because I've been having problems with the Central. I placed both drives in a safe before I left. When I returned, and connected them again, the Central shows the drive is empty. Maybe I moved the files instead of copying them? I'm not new to this, but mistakes happen. When I try to copy them back to the Central from the other drive I get a message that there is not enough space, even with a very small file. The properties of the Central shows 0 bytes, but yet nothing can be placed on it. Is there a way to reformat the Central? I've tried resetting it with no luck. Any help?