Is the 90TB HDD storage pre-installed, or will I need to purchase and install the hard drives separately?

The hard drives are included separately and not installed, so installation is required.

Questions & Answers: Synology DiskStation DS1520+ NAS Server with Celeron 2.0GHz CPU, 8GB Memory, 90TB HDD Storage, 1TB M.2 NVMe SSD, 4 x 1GbE LAN Ports, DSM Operating System

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Synology DiskStation DS1520+ NAS Server with Celeron 2.0GHz CPU, 8GB Memory, 90TB HDD Storage, 1TB M.2 NVMe SSD, 4 x 1GbE LAN Ports, DSM Operating System

Synology DiskStation DS1520+, Hard drives and memory upgrades included separately, NOT installed, installation required.
Celeron J4125 Quad-Core 2.0GHz CPU; 8GB DDR4 non-ECC Memory; M.2 Storage: 1TB (2 x 500GB) M.2 Solid State Drives for Ultra-Fast Storage; File Storage: 90TB (5 x 18TB) SATA 3.5" HDDs for High-Capacity Storage; 4 x RJ-45 1GbE LAN Ports (with Link Aggregation / Failover support); 2 x USB 3.2 Ports; 2 x eSATA Ports
Features: Cache Acceleration, Virtual Machine Manager, Security Advisor, AES 256-bit Encryption, 2 Factor Authentication, Surveillance Station Suite, 4K Multimedia Server role, Desktop Backup, Hyper Backup, Snapshot Replication, Synology Drive, and many more
Synology NAS chassis comes in a sealed box.
Hard drives & memory upgrades included separately, NOT installed, installation required

$3,699^.00 –