You probably need to upgrade the code on the SC4020 so the system will recognize those SSD drives. That's why the wizard won't let you move forward when those drives are selected. 
Hi, Just purchased a new SC4020.  Didn't come with any docs but I eventually found a deployment guide online.  I've completed the prejoin information via a serial connection and both controllers have booted successfully.  Logged into the gui, set the admin password and loaded the license file correctly.  Next step is to Create a Disk Folder.  All disks are selected by default so I clicked on Continue and that's it.  The gui is frozen and you can do nothing except close the window (which if you do, a pop up tells you that the Setup procedure is incomplete).  So, what next?  Does it take  a long time to create a disk folder?  The only thing I did notice is that my first 12 RI SSD disks are listed in the gui as an Unknown type.  The second group of 12 disks are listed as type 10k (which is correct). Thought I'd try the forum first before I log a support job. Cheers, Mike
SC4020 Create Disk Folder