Looking for a videocard? In Stock Videocards One per customer please

Synology Expansion Unit RXD1219sas



Reliable and highly scalable SAS storage expansion unit for your Synology servers

On-the-fly SAS expansion up to 12 additional bays

RXD1219sas is a 2U expansion unit designed to work automatically when connected, providing an effortless storage space upgrade solution for your Synology servers1. You can add up to 12 additional 2.5" / 3.5" SAS drive bays on the fly when connected directly with a mini-SAS HD cable.

Designed for maximum reliability

The redundant power supplies ensure maximum service uptime. On the rare occasion when a failure occurs, you can instantly replace the hot-swappable drive trays, and with the key system components modularized, SAS modules and system fans can also be replaced with ease.

High-performance data transmission

The mini-SAS HD provides high bandwidth connectivity to achieve maximum throughput during data transfer between your Synology server and RXD1219sas. It allows the drives in the connected RXD1219sas to operate as if they are the internal drives of the Synology server with no data latency.

5-year warranty

As we're committed to improving product innovation and quality, Synology guarantees a robust and reliable data management experience with a 5-year limited warranty2, providing responsive technical support and hardware replacement services to maximize your return on investment.

Hardware Specifications

Applied Models

Supports creating volumes on a single unit only



Drive Bays


Compatible Drive Type (See all supported drives)

3.5" SAS HDD

2.5" SAS HDD

2.5" SAS SSD

Maximum Internal Raw Capacity

192 TB (16 TB drive x 12) (Capacity may vary by RAID types)

Hot Swappable Drive



"Compatible drive type" indicates the 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


SAS OUT-port



Size (Height x Width x 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


18.2 kg

Rack Installation Support

4-post 19" rack (Synology Rail Kit - RKS1317)


The rail kit is sold separately


Power Supply Unit / Adapter

500 W

AC Input Power Voltage

100 V to 240 V AC

Power Frequency

50/60 Hz, Single Phase

Power Consumption

299.79 W (Access)

British Thermal Unit

1022.93 BTU/hr (Access)

Redundant Power Supply (for RP model)



Power consumption is measured when it's fully loaded with Seagate ST3600057SS hard drive(s).


Operating Temperature

0C to 35C (32F to 95F)

Storage Temperature

-20C to 60C (-5F to 140F)

Relative Humidity

5% to 95% RH


System Fan

60 mm x 60 mm x 4 pcs

Easy Replacement System Fan


Noise Level*

60.9 dB(A)


Noise Level Testing Environment: Fully loaded with Seagate ST2000VN000 hard drive(s) in the idle state. Two G.R.A.S. Type 40AE microphones, each set up 1 meter away from the Synology expansion unit at the front and rear. Background noise: 16.49-17.51 dB(A); Temperature: 24.25-25.75C; Humidity: 58.2-61.8%.










5 Years


The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more)

Environment & Packaging


RoHS Compliant

Packaging Content

Main Unit X 1

Accessory Pack X 1

AC Power Cord X 2

Expansion Cable: Mini-SAS HD X 2

Quick Installation Guide X 1

Optional Accessories

Synology Rail Kit Sliding - RKS1317

No additional files, specification sheets, guides or documentation found for product.

Warranty: 12 Month Return To Base

Full manufacturers warranty details are available at the manufacturers (Synology) web site.

Unless otherwise specified Techbuy is normally your first point of contact for warranty related returns, further information regarding our warranty policies and consumer guarantees is available on our policies and service & support pages.

To apply for return of a product just go to our returns page.

These terms are in addition to and do not affect any terms, conditions, guarantees and warranties implied by law.

Visitor Reviews

[ There are no visitor reviews for this product yet]

Review Product
Click on a thumbnail to view it below

No related products found.

L7: 11 | TM: 4 | LM: 54 | TY: 192 | T: 304

Secure Online Shopping

We accept the following with No surcharge on VISA, Mastercard and Paypal!
Techbuy Pty Ltd 2000 - 2021 All rights reserved.
All prices shown on techbuy.com.au are in $AUD and inclusive of GST. Prices and availability are subject to change without prior notice. Images displayed are accurate to the best of our knowledge and we will not be held responsible for purchases based soley on these images. All brands and names are trademarks of their respective companies. Shipping Australia wide to all metro and regional areas (Sydney, Melbourne, Brisbane, Adelaide, Perth) and Internationally. For more information, please see our usage policies.