Apps removed from new HD

By mistake I removed the apps from my new 4TB HD! The space left is now 18,6MB, so I can’t put the apps back on the HD. Tried to format it to Mac OS journaled isn’t possible, getting errors! Anyone an idea to restore the 4TB and make the HD useful again??

The apps are on a separate partition called a VCD.
The main data partition is separate from that. Looks like you’re trying to format the wrong partition.

But all I see in Finder are the Macintosh hard drive and WD_apps. So where do I find My Book??
The other partition??

It’s solved!! Disconnected the power and connected again, could format the drive and it’s OK now!! Thanks a lot for your help!!