Dual-Bay 2.5” to 3.5” SATA Hard Drive Adapter Enclosure with RAID

Install two 2.5” SATA drives into a 3.5” drive bay and get increased performance or data redundancy with RAID

Product ID: 35SAT225S3R

4.4 stars (7 reviews) |
  • Upgrade your system performance by installing two 2.5” SSDs/HDDS in a 3.5" drive bay
  • Features hardware RAID - RAID 0, 1 plus JBOD and spanning to enhance drive performance or add redundancy
  • Installs easily into internal or external 3.5” drive bays
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In stock: CA: 22 | US: 412

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This unique dual-bay adapter enclosure gives you an easy and cost-effective way to upgrade legacy systems such as desktop PCs and servers, by letting you install two 2.5" solid-state drives or hard drives into a single 3.5" drive bay.

Upgrade your system performance

The adapter enclosure lets you install newer, higher performing drives such as SSDs into legacy systems that may only support 3.5” hard drives. The enclosure provides a cost-efficient way for companies and organizations to enhance storage performance and reliability without expensive upgrades to core IT systems. It's also ideal for system administrators and integrators who want to build a system or upgrade a system with limited SATA interfaces to take advantage of the increased drive performance of 2.5” SSDs or increased capacity with support for two drives.

The adapter enclosure allows you to install two 2.5" SATA drives into an internal or external 3.5-inch bay, such as a drive drawer caddy or tray, or 3.5" drive enclosure. To utilize the full speed potential of your SATA III hard drives, the drive converter supports SATA III for transfer speeds up to 6Gbps. Suitable for drives with a height of up to 9.5 mm, virtually any 2.5" SATA drive can be made to look and function like a 3.5" drive.

Enhanced performance and data redundancy with RAID

The adapter enclosure is equipped with hardware RAID to provide improved performance and data redundancy. The enclosure supports both RAID 0 and RAID 1 as well as Spanning, and JBOD, and lets you choose your preferred backup mode by simply adjusting the RAID setting switch.

The RAID 1 functionality is ideal in a hot-swapping server environment, providing a level of security and reliability to your data through data redundancy. With RAID 0 support, you can combine the storage capacity of the two hard drives and achieve faster read and write speeds.

Easy and flexible installation

You can install the adapter enclosure into a desktop PC or server. It offers flexible use in hot-swap bays or in a more fixed, permanent installation in a 3.5” hard-drive mounting bay with standard mounting holes. Once installed, you simply slide two 2.5” HDDs/SSDs into the adapter enclosure, with no tools required. The aluminum housing protects installed drives in a durable enclosure.

The 35SAT225S3R is backed by a StarTech.com 2-year warranty and free lifetime technical support.


  • Upgrade legacy systems such as desktop PCs and servers
  • Build or upgrade a desktop PC or server to take advantage of the increased performance of two 2.5" HDDs or SSDs in a 3.5" drive bay - ideal for system integrators, IT professionals and prosumers
  • Upgrade core IT systems cost-efficiently

Partner Numbers

  • Ingram Micro Canada 3722CP
  • Tech Data Canada 5Z8037
  • SYNNEX Canada 5700705
  • ASI Distribution Canada 187048
  • D&H Canada 35SAT225S3RCA
  • UPC 065030864381


  • OS Independent logo
OS independent; No software or drivers required


Warranty Information Warranty 2 Years
Connector(s) 1 - Drive Connectors SATA Data & Power Combo (7+15 pin)
Environmental Operating Temperature 0°C to 55°C (32°F to 90°F)
Storage Temperature -20°C to 55°C (-4°F to 131°F)
Humidity 5% ~ 65%
Hardware Front Door Key Lock No
Number of Drives 2
Drive Size 2.5in
Compatible Drive Types SATA
Drive Installation Removable
Number of internal 3.5 inch bays 1
Supported Drive Height(s) 9.5mm
Fan(s) No
Chipset ID ASMedia - ASM1092R
Indicators 1 - LED Indicators Bay 1 HDD Error
Bay 2 HDD Error
Packaging Information Package Height 1.4 in [3.6 cm]
Package Length 6.4 in [16.2 cm]
Shipping (Package) Weight 9.5 oz [270.0 g]
Package Width 4.5 in [11.4 cm]
Performance Maximum Data Transfer Rate 6Gbps
Port Multiplier Yes
Hardware Raid Supported Yes
Supported RAID Modes RAID 0 (Striped Disks)
RAID 1 (Mirrored Disks)
BIG (Spanning or Concatenation)
JBOD - (Just a Bunch of Disks)
Physical Characteristics Color Silver & Black
Material Aluminum and Plastic
Product Length 5.7 in [14.6 cm]
Product Width 4.0 in [10.2 cm]
Product Height 1.0 in [2.6 cm]
Weight of Product 7.9 oz [223.0 g]
Software OS Compatibility OS independent; No software or drivers required
Special Notes / Requirements Note TRIM and SMART have limited support while in a RAID configuration. A SATA controller with Port Multiplier support is required, in addition to the product configured in JBOD mode, to provide full TRIM and SMART support.
What's in the Box 1 - Included in Package dual-bay 2.5" to 3.5" drive converter
quick-start guide
4 - Included in Package mounting screws



3.5" to 5.25" Front Bay Mounting Bracket

Desktop Front Bay Adapter

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In stock: CA: 77 | US: 4556

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Compliance and safety

Compliance letters

Safety Measures

  • If product has an exposed circuit board, do not touch the product under power.
  • If Class 1 Laser Product. Laser radiation is present when the system is open.
  • Wiring terminations should not be made with the product and/or electric lines under power.
  • Product installation and/or mounting should be completed by a certified professional as per the local safety and building code guidelines.
  • Cables (including power and charging cables) should be placed and routed to avoid creating electric, tripping or safety hazards.
*Product appearance and specifications are subject to change without notice.

Customer Reviews

(7 reviews)
4.4 out of 5 stars
  • 5 (4)
  • 4 (2)
  • 3 (1)
  • 2 (0)
  • 1 (0)
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1 - 7 of 7 Reviews
(5 Stars)

Works Great!

By: Dwardo_69 - 03-07-2017
I had two spare 2.5" hard drives that I pulled from dead laptops and used this enclosure. I put the hard drives into the enclosure, put it into JBOD mode to make the two hard drives act as one big one and installed it into the computer with the supplied mounting screws. After hooking the enclosure up to appropriate ports, I turned the computer on. The Windows OS found the drives quickly and installed the necessary drivers. After I formatted the drives, they were ready to be used. Now I have more storage space on my computer. The enclosure is light but it seems to be made well and sturdy. The access speeds were good and as expected. The supplied mounting screws were a nice touch. The manual was straight forward but it does not mention what each mode does. IE JBOD, Raid 1, Raid 0. Overall, great unit that does what it's meant to do. I received this product in exchange for an unbiased review.
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(5 Stars)

WOW! Awesome item! Couldn't be happier

By: Macphoto - 03-12-2017
What a great little product! I have been working with computers for years and this little item was perfect for a project I had. How to get 2 - 2.5 1tb drives into my old Mac Pro. This was perfect! For one thing because it has all the normal 3.5" holes it fits the carriers with ease (this is a problem for Older Mac pro users- we always have to buy expensive adapters) The enclosure gives you the options of Big, Raid 0 , Raid 1, or JOBD. So big is just that one large volume, Raid 0 is a striped raid for fast data access, Raid 1 is a mirrored raid(whats on drive one is on drive 2) and JOBD (just a bunch of drives). Now for my Mac Pro upgrade I used the Raid 0, I was looking for a use of 2 - 1tb 2.5" drives I had and wow..did this work great. put the drives in flip the switch to the appropriate spot and format in Disk Utility and it was ready to go. I decided to use that as a fast boot drive and it did not disappoint. I would love to try this one day with 2 SSD's to see the difference. All I can say is that this device is easy to use. Works as it should! The quality of the build is excellent and I could not be happier. “I received this product in exchange for an unbiased review.”
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(4 Stars)

Interesting Product

By: JPthompson - 03-14-2017
Interesting product. It's something you wouldn't really imagine would work right but it does. All four modes (BIG, raid-1, raid-0, JBOD) worked flawlessly when tested on Windows 10. I'm currently running two SSDs in RAID-0 for a storage drive at the moment. If your mother board doesn't support Intel RAID then this is a cheap way to get RAID features in a budget machine. Pros: Works great, solid construction and materials. Cons: Having a difficult time finding a good use case for the product. I received this product in exchange for an unbiased review.
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(4 Stars)

So much in well though of product

By: NickD_CA8 - 03-18-2017
I have used this hard drive enclosure and it is working well for most of my needs. I have inserted 2.5" SATA disks from multiple manufactures and multiple size for testing. This enclosure is the same size as an internal 3.5" disk drive and styled to look similar. It is very light when there are no drives in it even though it is made of sturdy plastic and metal with built-in RAID controller. The end easily opens to be able to slide two 2.5" drives inside of it. The end that opens has a built in lever to eject the 2.5" drives and when closed the cover pushes the 2.5" drives into the connector. The other end with the connector has a small 4 position switch for changing the setup of the disk that are inserted. Coping files to the drive was very quick and seemed similar to if the drives were connected independently. The drive has 4 different modes to choose from for saving data to the two drives. 1) BIG: This just spans the data across several disks. Disk of any size can be used and the total available space is the total from both drives (250GB + 500GB = 750GB). If the drives are removed from the reader, the data which was stored on that disk is still available. If the drives are re-inserted in a different order, it doesn't seem to matter and all data is now available again. 2) RAID-1: This is essentially a mirror of the two drives to provide redundancy if one fails. If using different size drives, the size available is the total of the smallest disk (250GB + 500GB = 250GB). If I copy files to the disk in this setup, then remove and re-insert just one disk without the enclosure I am able to read all the data. This is the best option for protecting your files. 3) RAID-0: This is similar to BIG where you have a span of data across the disks. The difference is the total available space is the smallest drive x2 (250GB + 500GB = 500GB). Also, when the drives are removed the data is not available. If I put them back in the caddy in different places, the data was available. 4) JBOD: Just a Bunch Of Disks. Each disk connected should be displayed in the operating system as a separate disk of its own size. During my testing only the disk in the slot at the top of the enclosure would show up in the operating system. I didn't troubleshoot this much, but I figured if I were using this option, I would just connect the disk directly. So far, other than with the JBOD setting, I have not had any problems with this enclosure and it works well. I received this product in exchange for an unbiased review.
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(5 Stars)

Perfect for SSD's

By: _shamca_ - 03-26-2017
I like the idea of getting 2x240Gb SSD's into the one space my Mac Pro had remaining, to use as storage for Lightroom cache & catalog files. Once I loaded up the drive with 2 SSD's, I selected Raid0 (just wanted to stripe together for more capacity) by setting the slider found on the end of the product. The unit claims to be OS independent and when I plugged it into the mac, there was nothing else to do. Apple's Disk Utility recognized it as a single drive and there was no additional configuration to do to accommodate the raid functionality; it's all handled internally by the unit and no software was required. The unit was well made, came with screws and the mounting holes were in standard locations. I was provided this device for review purposes.
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(3 Stars)

No software to indicate disk error in windows

By: besamsam - 08-29-2019
I set up a Raid1 to install 2 pcs 1TB HDD for protection. Due to its enclosure is installed inside the PC case. But it doesn't have any software can install in the windows system that can check/indicate the status of the disk and/or warning when HDD error.
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(5 Stars)

Work Really Well

By: BolivarTech - 09-18-2021
I was looking for something like that for my project, and it is really easy to use and the configuration is easy, just move a switch to the desire position. The only thing is that status LED is on the back and it would be great to be on the front next to the door
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