Scan and fix

Hello, I have a Drobo that when booting gets the following error: Scan and Fix.
Windows 7 64 bit operating system
Drobo (Gen 2)
A total of 4 drives (2 tb each)
Drobo Dashboard version: 2.2.2 {54676}
Status lights are all green
I have used about 20% of the total space

I ran chkdsk /x for several days but stopped it because it look like it stalled at 79%

Many of the folders (higher in the alphabet) seemed to have disappeared, although the lower alphabet folder are there and visible.

I have searched the forums, but haven’t really found anything. If this has been addressed before, please point me to the thread.