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Product Overview

Manufacturer product information

On-the-fly storage capacity expansion for Synology FlashStation. Expand your Synology FlashStation with Expansion Unit FX2421 for 24 additional 2.5” drive bays whenever needed. Without additional software configuration, FX2421 is immediately ready for use when connected to Synology FlashStation. FX2421 expansion units can also be used as a dedicated and rapidly accessible local backup destination. The high-speed expansion cable provided with FX2421 enables high bandwidth connectivity for maximum data throughput between your Synology FlashStation and Expansion Unit. Drives in FX2421 operate with minimum data latency, as if installed directly on your Synology FlashStation, allowing you to take advantage of high SSD I/O performance. The FX2421 is a highly reliable and thoroughly tested expansion unit that comes with hot-swappable drive trays and modularized components. Redundant power supplies and system fans can be replaced with ease to ensure maximum service uptime. The optional RKS1317 sliding rail kit provides fast rack fixing lock support for quick and secure rack cabinet installation. 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 maximize your return on investment.

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Technical Specifications

Structured product specifications

Applied Models > Supports creating volumes across different units FS series:FS6400, FS3600, FS3400
Notes Expansion Unit FX2421 can only be used with identical expansion units.To have better performance, we recommend creating storage volumes physically located within the same NAS or Expansion Unit, rather than creating volumes across your NAS and Expansion Unit.DSM version requirement: 6.2.3-25426-2 or later version.
Storage > Drive Bays 24
Drive Type (See all supported drives) 2.5" SAS HDD2.5" SAS SSD2.5" SATA SSD
Notes #2 Synology only guarantees full functionality, reliability, and performance for Synology drives listed on the compatibility list. The use of non-validated components may limit certain functionality and result in data loss and system instability."Compatible drive type" indicates drives that have been tested to be compatible with Synology products. This term does not indicate the maximum connection speed of each drive bay.
External Ports > SAS IN-port 1
SAS OUT-port 1
Appearance > Size (Height × Width × Depth) 88 mm x 430.5 mm x 692 mm
Size (Height x Width x Depth) (with server ears) 88 mm x 482 mm x 724 mm
Weight 14.5 kg
Rack Installation Support 4-post 19" rack (Synology Rail Kit - RKS-02)
Notes #3 The rail kit is sold separately
Power > Power Supply Unit / Adapter 500 W
AC Input Power Voltage 100V to 240V AC
Power Frequency 50/60 Hz, Single Phase
Power Consumption 190.99 W (Access)
British Thermal Unit 651.68 BTU/hr (Access)
Notes #4 Power consumption is measured when it is fully loaded with HGST 1.8TB HUC101818CS4204 hard drive(s).
Temperature > Operating Temperature 0°C to 35°C (32°F to 95°F)
Storage Temperature -20°C to 60°C (-5°F to 140°F)
Operating Humidity 8% to 80% RH
Storage Humidity 5% to 95% RH
Others > System Fan 80 mm x 80 mm x 4 pcs
Noise Level 57 dB(A)
Notes #5 Noise Level Testing Environment: Fully loaded with Toshiba 600GB AL14SEB060N hard drive(s) in the idle state. Two G.R.A.S. Type 40AE microphones, each set up 1 meter away from the Synology NAS at the front and rear. Background noise: 16.49-17.51 dB(A); Temperature: 24.25-25.75˚C; Humidity: 58.2-61.8%
Certification ULFCCCEEACVCCIRCMKC
Warranty 5 Years
Notes #6 The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more)
Environment RoHS Compliant
Packaging Content Main Unit × 1Accessory Pack × 1AC Power Cord × 2Expansion Cable: MiniSAS-HD X 1Quick Installation Guide × 1
Optional Accessories Enterprise Series 2.5" SATA SSD: SAT5200 SeriesRail Kit Sliding: RKS-02