The Synology DX1222 is a 12-bay expansion unit designed for seamless storage scalability with DS3622xs+ and DS2422+ NAS systems. Connecting via a high-speed Mini-SAS HD port, it enables online volume expansion without interrupting services or reformatting drives. This plug-and-play unit supports hot-swappable 3.5" and 2.5" SATA drives and is optimized for Synology enterprise HDDs and SSDs. Managed directly through DSM, it allows businesses to add up to 24 additional bays for backup or file storage while maintaining unified administration and maximum reliability for growing data deployments.