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Trade pricing for verified resellers, proforma issued on official company letterhead for PO processing.
Education & Public Sector Pricing available for schools, universities, NHS, and government organisations. Contact our Public Sector Team on 020 8191 9223 or email info@screenmoove.com.
  • Description
  • Specifications
  • Downloads
  • Synology RackStation RS4021xs+ | 3U Rackmount NAS, 16-Bay, Intel Xeon D-1541, 16GB DDR4 ECC, Dual 10GbE & 5-Year Warranty

    Fast and Reliable Enterprise Connectivity
    Double bandwidth
    Upgrade network bandwidth in minutes by 2x or more with Synology’s range of 10GbE NICs.
     
    SSD cache
    Boost read/write IOPS by up to 16 times by enabling SSD cache with our Synology M.2 NVMe adapter cards. 
    (Network adapter cards, expansion units, other PCIe add-in cards, and storage drives are sold separately. Refer to the compatibility list for compatible devices.)
     
    Next-generation file system for better data protection
    The Btrfs file system introduces advanced storage technologies and optimized snapshots to prevent data corruption and reduce maintenance overhead. While ensuring high-level data integrity, it also offers flexible, efficient data protection and recovery tools.
     
    License-free data protection
    Enterprise RackStations integrate various backup applications into an intuitive user interface, offering durable storage technologies to safeguard your valuable data on any device.
     
    Fully certified storage virtualisation solutions
    Synology iSCSI storage fully supports most virtualisation solutions to enhance work efficiency with easy management interface. VMware vSphere 6 and VAAI integration helps offload storage operations and optimises computation efficiency. Windows Offloaded Data Transfer (ODX) speeds up data transfer and migration rate. OpenStack Cinder support turns your Synology NAS into a block-based storage component.
     
    All-in-one solution
    Synology have a complete range of drives from large capacity 3.5" HDDs to compact NVMe SSDs to cost-effectively boost performance.
     
    5-year warranty and next-business day onsite support options available
    At Synology, we are committed to product innovation and quality. Synology guarantees a robust and reliable data management experience with a 5-year limited warranty, providing responsive technical support and hardware replacement services to maximise your return on investment.

  • Feature Description
    Device Type NAS server, Rack-mountable - 3U
    Dimensions / Weight Width 48.2 cm, Height 13.23 cm, Depth 65.65 cm, Weight 17.4 kg
    Installed Devices / Modules 0 installed / 16 max
    Total Storage Capacity 0 GB
    Expansion Bays 16x hot-swap 2.5"/3.5"
    Expansion Slots 2x PCIe 3.0 x8, 4x DIMM (3 free)
    Interfaces 4x 1GbE RJ-45, 2x 10GbE RJ-45, 2x USB 3.2 Gen1 Type-A, 2x Expansion Ports, 1x Management
    Processor Intel Xeon D-1541, 8-core, 2.1 GHz (Turbo 2.7 GHz)
    Memory 16 GB DDR4 ECC (installed), Max 64 GB
    Storage Controller RAID, SATA 6Gb/s, RAID 0/1/5/6/10, JBOD, RAID F1, Hot Spare (RAID 1/5/6/10/F1)
    Networking Protocols: PPTP, L2TP, iSCSI, SMTP, FTP, DHCP, POP3, IMAP. Services: AD, NFS, SMB, AFP, WebDAV, CalDAV
    Encryption 256-bit AES
    Network Features Firewall, VPN, LDAP, VLAN, WOL, Print Server, Antivirus, High Availability, Web Server, File Sharing, ACL, DHCP, FTP, BitTorrent, Mail Server, Surveillance Station
    Power Supply 2x 800W Internal PSU, Redundancy 1+1, AC 120/230V 50/60Hz, 145.79W Operational
    Environmental Operating Temp 0–35°C, Humidity 5–95%, Noise 50.2 dBA
    Warranty 5-Year Limited Warranty
    Included Accessories Accessory pack
    Compliance FCC, BSMI, VCCI, RCM, EAC, CCC, KC, UL, RoHS, DLNA Certified
  • Description Downloads
    Synology RackStation RS4021XS+ Rack (3U) Ethernet LAN NAS/Storage Server DataSheet Download
Synology RackStation RS4021XS+ Rack (3U) Ethernet LAN NAS/Storage Server
Synology RackStation RS4021XS+ Rack (3U) Ethernet LAN NAS/Storage Server
SKU: RS4021XS+
🚚 Order before 3PM, get it by tomorrow.
Synology RackStation RS4021XS+ Rack (3U) Ethernet LAN NAS/Storage Server
SKU: RS4021XS+
🚚 Order before 3PM, get it by tomorrow.

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LATEST CASE STUDIES

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  • Woodys Case Study - Digital Signage
    January 14, 2026

    Digital Menu Boards with Custom Curved Mount Installation for Woodys, Andover

    HOSPITALITY • DIGITAL MENU BOARDS
    Four-screen digital menu boards installed for Woodys in Andover, featuring a bespoke curved mounting layout and CMS-controlled content for a bold, immersive menu experience.
    Client
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    Location
    Andover
    Sector
    Hospitality, QSR
    Installation Date
    February 2025
    Solution
    Digital Menu Boards + CMS
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    43" Digital Menu Boards
  • Digital Signage & Freestanding Display for Naan Staap, Leicester
    January 14, 2026

    Digital Signage & Freestanding Display for Naan Staap, Leicester

    HOSPITALITY • DIGITAL MENU BOARDS
    Multi-screen digital menu boards and floor-to-ceiling ultra-high-brightness window display installed for Naan Staap in Leicester, delivering clear menus and strong street-level visibility impact.
    Client
    Naan Staap
    Location
    Leicester
    Sector
    Hospitality, QSR
    Installation Date
    May 2025
    Solution
    Menu Boards + UHD Display
    Products
    32" Menu Boards & 49" Display
  • Digital Menu Boards and Window Displays for Karak Chaii
    January 14, 2026

    Digital Menu Boards and Window Displays for Karak Chaii

    HOSPITALITY • FOOD & DRINK
    Digital menu boards and window screens supplied for Karak Chaii in Birmingham, improving menu clarity, speeding ordering, and attracting increased street-level footfall for growth.
    Client
    Karak Chaii
    Location
    Birmingham
    Sector
    Hospitality, Café
    Completion Date
    March 2024
    Solution
    Menu Boards + Window Screens
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    Menu Boards & Digital Window Screen
  • Digital Signage & Installation Service for Henkinz, St Albans
    January 14, 2026

    Digital Signage & Installation Service for Henkinz, St Albans

    HOSPITALITY • WINDOW DIGITAL SIGNAGE
    50-inch 4K window digital signage installed for Henkinz in St Albans, delivering high-impact street-facing promotions with simple USB plug-and-play content updates for retail visibility.
    Client
    Henkinz
    Location
    St Albans
    Sector
    Hospitality, QSR
    Installation Date
    May 2025
    Solution
    Digital Signage
    Products
    50" 4K Window Display
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