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Overview

The Synology DiskStation DS420j is a 4-bay NAS enclosure designed for home users and small offices. It offers a cost-effective way to centralize data storage, sharing, and backup. With support for up to 64TB of raw storage (4×16TB drives), it's ideal for photo libraries, media collections, and file serving. What sets the DS420j apart is Synology's DiskStation Manager (DSM) operating system. DSM provides an intuitive web interface, mobile apps for remote access, and a rich package ecosystem. The unit supports RAID 0/1/5/6/10, giving you flexibility between performance and redundancy.

Connectivity & Compatibility

Dual Gigabit Ethernet ports with link aggregation support for increased bandwidth or failover. Two USB 3.0 ports for external storage or UPS connection. Drive compatibility: 3.5-inch SATA HDD/SSD (hot-swappable trays). 2.5-inch drives can be used with included adapters. Supported file systems: ext4, Btrfs (DSM 7.0+). RAID levels: Basic, JBOD, RAID 0, 1, 5, 6, 10. Memory: 512MB DDR4 (soldered, not expandable).

Product Info

The DS420j launched in 2020 as an entry-level to mid-range 4-bay NAS. Pricing in Japan is around ¥40,000–¥45,000 (before tax), offering excellent value for a 4-bay unit. Warranty is 2 years (extendable). Included accessories: power adapter, Ethernet cable, quick installation guide, screws, and drive trays. Market positioning: It's the go-to choice for users who want a reliable 4-bay NAS without breaking the bank. The ARM-based CPU keeps costs low but limits advanced features like virtualization and Docker.

Best Use Cases

Home media and photo backup: Use Synology Photos to automatically back up smartphone images. Stream videos to TVs and tablets via Plex or Video Station (note: no 4K transcoding). Small office file server: Suitable for teams of 5–10 people sharing documents. RAID 5 provides a good balance of capacity and data protection. Budget-conscious 4-bay buyer: If you need four drive bays but can't afford higher-end models, the DS420j delivers core NAS functionality with a mature OS. Remote access user: DSM's QuickConnect and mobile apps let you access files from anywhere without complex VPN setup. Not recommended for: running virtual machines, Docker containers, or requiring 10GbE networking. For those workloads, consider the DS720+ or DS920+.

Things to Consider

Memory is fixed at 512MB and cannot be upgraded. Heavy multitasking or many concurrent connections may cause slowdowns. The Realtek RTD1296 CPU is ARM-based and lacks hardware transcoding. If you need to transcode 4K video on the fly, look at Intel-based models. Fan noise is rated at 19.8 dBA, which is quiet, but vibration from four HDDs may be noticeable in a silent room. The included 36W power adapter is sufficient for most configurations, but check total power draw if using high-capacity enterprise drives. * Initial setup requires a computer or smartphone with a web browser to install DSM. ## FAQ
Q: Can I run Docker on the DS420j? A: No. Docker is not supported on ARM-based Synology NAS. If you need Docker, choose an Intel-based model like the DS720+. Q: Can I back up to an external USB drive? A: Yes. Connect a USB drive and use Hyper Backup to schedule backups from the internal volumes to the external drive. Q: What is the usable capacity with four 4TB drives in RAID 5? A: RAID 5 uses one drive's worth of capacity for parity. With 4×4TB, usable capacity is approximately 12TB (before formatting). After formatting with Btrfs, expect around 10.9TB.

Product Disclosure (Amazon)

  • Manufacturer: Synology
  • Seller: New Oriental Technology
  • Fulfilled by: New Oriental Technology
  • ASIN: B0B2RN4SJT
  • Note: This article covers a manufacturer-made product based on Amazon listing details.