Hi, Yes, the enclosure needs full rows installed.
Hello, Currently we have the following configuration: ME4084 (28 disks in total) with two Virtual pools with one Virtual disk group (14 x 3.5" HDD 7k 512n ADAPT) in each pool. 14 disks are installed in the top drawer and 14 in the bottom drawer. We are going to expand our virtual disk groups with the same disks (3.5" HDD 7k 512n). In the "Dell EMC PowerVault ME4 Series Storage System Deployment Guide" ---> "Populating drawers with DDICs" we found the following statements: Can you confirm that we must install only 14 or 28 disks at once? I mean there is no option to install for example only four additional disks to the top drawer and four to the bottom drawer, right?
Dell EMC PowerVault ME4084. Populating drawers. Expanding ADAPT virtual disk 
group.