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Mon, Thu 13:00 - 17:00
Tue, Wed 10:00 - 12:00
Fri 13:00 - 15:00


Internal RAID for 2x 3.5" and 1x 2.5" HDD/SSD in 2x 5.25" bay


• 2x 3.5" SATA/SAS and 1x 2.5" SATA HDD/SSD in 2x 5.25" bay
• RAID 0 / 1 / JBOD (Large) / Nor (SINGLE) for 2x 3.5" HDD
• Robust industrial design with aluminum / metal
• HDD/SSD tray with key lock
• LED for power and HDD/SSD access
• 1x fan (6x6 cm) for heat dissipation
• LED and audio alarm for fan failure & overheat
• Alarm temperature adjustable (55° C, 60° C, 65° C)
• Plug & Play and HotSwap
• Windows, macOS compatible





Internal RAID for 2x 3.5" and 1x 2.5" HDD/SSD in 2x 5.25" bay

Raid system for 2x 3.5 HDD/SSD in a 2x 5.25" bay

Supports 2x 3.5" + 1x 2.5" HDDs or SSDs

HDD capacity unlimited


Silent 6 cm fan

Double Raid!

Two 3.5" HDDs fit into this enclosure and can be used in RAID modes 0, 1, JBOD (Large) / Nor (SINGLE) and one 2.5" HDD or SSD can be installed and used as an extra but it’s not part of the raid network.

Better safe than sorry

The enclosure is made entirely of metal and the hard disks are provided with a lock that prevents accidental opening and unauthorized access. An LED also indicates operation and disk access for each storage medium.

When it’s hot

The aluminum dissipates heat very well and the cooling of the drives during heavy operation is ensured by a 60 mm fan on the back. An alarm warns of excessive temperatures or fan failure via LED and sound.

Reviews and Awards

Here you can find some Links to Reviews and Awards
Show all reviews


In our support area you can find our download center, where we provide you with up to date firmware updates, drivers and software for many RaidSonic products. We answer your most frequently asked questions and if the need arises, you could contact our support team directly.

To read and print the file, you require the program Acrobat Reader, which you can download for free from the Adobe website





FAQ's für SOHO/RAID-Solutions
No answer found? Please contact our support team.

IB-RD4320StUS2 - Device switches off after a few seconds

Question: Why turn on the IB-RD4320StUS2 few seconds after switching off by itself?

Answer: Please verify that the IB-RD4320StUS2 is properly connected to your PC. This is a normal behavior of the device when it is not connected by a data cable to the PC. Please connect the USB 2.0 or eSATA cables.

Interesting facts about the new USB 3.1 standard
The USB interface has been the standard for PC hardware and the new USB 3.1 standard entails several improvements. Not only the data transfer rates are much faster but also the charging of smart devices. And finally, the reversible-plug connector is introduced to USB as well.

Compared to USB 3.0 the transfer rates are doubled, thus the USB 3.1 interface achieves speeds of up to 10 Gbit/s which makes the interface fast enough to even max out current SSDs.

Another novelty, the reversible-plug USB Type-C connector, can be plugged into an appropriate USB Type-C connector. Without worrying about its directions, it will fit either way. USB Type-C is able to connect monitors via its USB interface. At the same time, data can flow further using the very same USB port. Theoretically, the transfer rates should suffice to connect 5K monitors which are not yet widely-used.

On top of that the new Type-C connector allows the use of Power Delivery (PD). A feature which provides the possibility to charge devices using up to 100 Watt. Supposably, even notebooks could be charged via USB. In the near future it might even be possible for the new Type-C interface to become the new standard for smartphones, tablets and other smart devices because of the connector's small size.

The already well-established USB 3.0 interfaces Type-A and Micro-B will still be preserved for the future, though, and will also have transfer rates of up to 10 Gbit/s. Whether Type-C is completely going to replace the old-established USB interfaces is yet to be awaited. In the meanwhile, the compatibility between the old USB types and the new Type-C is ensured by already available USB adapters or a PCI-E expansion card. This way the new USB type remains compatible with older PCs or notebooks, even without having Type-C ports.

RaidSonic Support and Service

When you have purchased a product from us our relationship doesn’t end, rather a new kind of relationship will start. It doesn’t matter if you have questions or you want to update an older product or you have a problem (with the product) that we shall solve, you are welcome. By the way, RMA means returnmerchandise authorization. Wenn Sie unter FAQs keine ausreichende Antwort auf Ihre Fragen gefunden haben, ist es vielleicht angebracht, mit unserem Support-Team in Kontakt zu treten.
Entweder per eMail oder per Telefon. In letzteren Fall seien Sie bitte vorbereitet, die Auskünfte, die im eMail-Formular angesprochen werden, am Telefon zu geben.

Support Hotline +49 (0) 4102 468 950

Support Contact

Hotline hours of our RaidSonic service and support team:
Mon, Thu 13:00 - 17:00 | Tue, Wed 10:00 - 12:00 | Fri 13:00 - 15:00


Below you can find general information regarding the product.



Article No:


EAN Code:





internal Raid


Aluminum + metal



HDD size (cm):

HDD size (inch):


HDD size (inch):


Hot & Swap:


Plug & Play:


HDD height:

HDD capacity:



Windows, macOS compatible

External data interface:

2x SATA connector

RAID Level:

RAID 0 / 1 / JBOD (Large) / Nor (SINGLE) for 2x 3.5" HDD


Up to 6 Gbit/s

Power connector:

2x 15 pin SATA power cable (not included) 2x Molex power cable (not included)

Box content:

1x IB-iR3521, 2x SATA data cable, 4x keys, 1x screw set, 1x manual

Packing unit:

8 pcs./carton

Total weight:

14.5 kg/carton

Gross weight (incl. packing):

1.674 kg

Net weight:

1.484 kg


520x380x280 mm

Dimension of packing box:

254x120x180 mm

Dimension of article:

145x140x42 mm

Country of origin:


Import tax: