4 Things to Know About the Synology DS423+’s Fixed-Bay Design
Regarding the Synology: 1. The DS423+ has four fixed bays with no way to add more storage later. It lacks eSATA ports and does not support expansion units, so what you buy is what you get.
This is fine if you know your storage needs upfront. The lack of expandability is not a flaw for users who plan their capacity from the start.
It is designed for homes and small offices that want RAID 5 protection. The four bays allow for a single large volume with redundancy, without paying for unused expandability.
Do not buy this if you expect to grow beyond four drives. If you think you might need more bays later, choose a model with expansion support instead.