Dell EMC PowerVault ME4084. Populating drawers. Expanding ADAPT virtual disk group.

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:

• The minimum number of disks that are supported by the enclosure is 28, 14 in each drawer.
• DDICs must be added to disk slots in complete rows (14 disks at a time).
• Beginning at the front of each drawer, install DDICs consecutively by number, and alternately between the top drawer and the bottom drawer. For example, install first at slots 0–13 in the top drawer, and then 42–55 in the bottom drawer. After that, install slots 14–27, and so on.
• The number of populated rows must not differ by more than one row between the top and bottom drawers.
• Hard disk drives (HDD) and solid-state drives (SDD) can be mixed in the same drawer.
• HDDs installed in the same row should have the same rotational speed.
• DDICs holding 3.5" disks can be intermixed with DDICs holding 2.5" disks in the enclosure. However, each row should be populated with disks of the same form factor (all 3.5" disks or 2.5" disks).

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?