What type of hard drives are included in the Synology DiskStation DS223j, and are they replaceable or upgradable?

The Synology DiskStation DS223j includes 32TB (2 x 16TB) 6Gb/s SATA 3.5-inch HDDs for high-capacity storage.

Questions & Answers: Synology DiskStation DS223j NAS Server with RTD1619B 4-Core 1.7GHz CPU, 1GB Memory, 32TB HDD Storage, 1 x 1GbE LAN Port, DSM Operating System

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Synology DiskStation DS223j NAS Server with RTD1619B 4-Core 1.7GHz CPU, 1GB Memory, 32TB HDD Storage, 1 x 1GbE LAN Port, DSM Operating System

RTD1619B 4-Core 1.7GHz CPU; 1GB DDR4 non-ECC Memory; 32TB (2 x 16TB) 6Gb/s SATA 3.5-inch HDDs for High-Capacity Storage
Efficient Operation: With low energy consumption at just 17.3 W during operation, the DS223j offers environmentally friendly data management
Streamlined Data Management: Import data from various sources 14% faster, sync across devices, and simplify file organization, making data management hassle-free
Comprehensive Data Protection: Utilizing the self-healing Btrfs file system and snapshot technology, the DS223j safeguards against data corruption and offers rollback options for accidental or malicious changes
Hard drives and memory upgrades included separately NOT installed, installation required