04-12-2023, 07:27 AM
It is a good practice to add drives that are the same size or bigger than existing drives in the RAID. If you are setting your RAID for the first time, you can mix any drive you want. You can use 4x10TB + 18TB drive. But in the future, you may need to add only 18TB or bigger drives. Synology and Terramaster support this initial drive mixing of any size.