How many hard drive bays does the DS2422+ have, and are they hot-swappable?

The DS2422+ has 12 hard drive bays.

Questions & Answers: Synology DiskStation DS2422+ NAS Server with Ryzen 2.2GHz CPU, 32GB Memory, 240TB HDD Storage, 4 x 1GbE LAN Port, DSM Operating System

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Synology DiskStation DS2422+ NAS Server with Ryzen 2.2GHz CPU, 32GB Memory, 240TB HDD Storage, 4 x 1GbE LAN Port, DSM Operating System

Ryzen V1500B 4-Core 2.2GHz 4MB CPU; 32GB DDR4 PC4-21300 2666MHz SO-DIMMs; 240TB (12 x 20TB) 6Gb/s SATA 3.5-inch HDDs for High-Capacity Storage
High-Performance Storage Hub: The 12-bay Synology DS2422+ is tailored for small and medium businesses, offering robust storage, file sharing, and data protection in multi-user environments. Its Ryzen 4-core 2.2 GHz CPU drives 2,201/1,383 MB/s sequential read/write throughput, ideal for editing high-quality video and serving as VM storage
Enhanced Performance: Experience 26.8% faster sequential read and a staggering 122.9% faster sequential write compared to its predecessor in handling demanding tasks smoothly
Comprehensive Data Protection: Secure data with the Active Backup Suite, ensuring backup for Windows clients, Office 365, Google Workspace, file servers, and virtual machines
Hard drives and memory upgrades included separately not installed, installation required