If you want a solution to divert from your 3.5" hot swappable harddrive bays to become hot swappable 2.5" bays then that is not possible, the CSE-PT17L drive trays don't support this, but you are able to mount up to 2 pieces 2.5" drives in the available 5,25 drive tray, the part to do this is called MCP-220-00044-0N