Hi,

I run 3TB Seagate drives, they took less than 30 minutes to format.

I think you are the first person on here to report on attempting to using 4TB drives in a Sooloos Store.

My only suggestion would be to power it off and try again.

I assume your Sooloos system is up to date software wise.

Regards,
Carl

861v6+ID40, HD621, 8000.2, 7200HC, 7200.2, SKYQ Silver, PS3, PDP-LX6090, QNAP TS870-Pro (8*6TB), Roon, iPadAir2.
[In Reserve] C15, MD600 (2*3TB), TwinStore RM (2*2TB)