| | | | |
| Synology DS220+ | Synology DS420+ | Synology DS720+ | Synology DS920+ |
| Drive Bays | 2 | 4 | 2 | 4 |
| Maximum Drive Bays with Expansion Unit | 2 | 4 | 7 | 9 |
| Maximum Internal Raw Capacity | 32 TB (16 TB drive x 2) (Capacity may vary by RAID types) | 64 TB (16 TB drive x 4) (Capacity may vary by RAID types) | 32 TB (16 TB drive x 2) (Capacity may vary by RAID types) | 64 TB (16 TB drive x 4) (Capacity may vary by RAID types) |
| CPU | 2-core 2.0 (base) / 2.9 (burst) GHz | 2-core 2.0 (base) / 2.9 (burst) GHz | 4-core 2.0 (base) / 2.7 (burst) GHz | 4-core 2.0 (base) / 2.7 (burst) GHz |
| Hardware Encryption Engine (AES-NI) | ✓ | ✓ | ✓ | ✓ |
| Memory | 2 GB DDR4 (Expandable up to 6GB) | 2 GB DDR4 (Expandable up to 6GB) | 2 GB DDR4 (Expandable up to 6GB) | 4 GB DDR4 (Expandable up to 8GB) |
| RJ-45 1GbE LAN Port | 2 (with Link Aggregation / Failover support) | 2 (with Link Aggregation / Failover support) | 2 (with Link Aggregation / Failover support) | 2 (with Link Aggregation / Failover support) |
| USB 3.0 | 2 | 2 | 2 | 2 |
| Compatible Drive Type | 3.5″ SATA HDD, 2.5″ SATA HDD, 2.5″ SATA SSD | 3.5″ SATA HDD, 2.5″ SATA HDD, 2.5″ SATA SSD, M.2 2280 NVMe SSD | 3.5″ SATA HDD, 2.5″ SATA HDD, 2.5″ SATA SSD, M.2 2280 NVMe SSD | 3.5″ SATA HDD, 2.5″ SATA HDD, 2.5″ SATA SSD, M.2 2280 NVMe SSD |
