Dual-Bay 2.5in Hard Drive Enclosure - USB 3.0 to SATA III 6Gbps with RAID
One high performance storage solution to support two SSD or HDD drives
Product ID: S252BU33R
This USB 3.0 2-bay enclosure for 2.5in drives gives you the performance you want in an external storage system - and features a stylish, compact design that looks great next to your Mac or PC. Ideal for professional business settings or home offices, it provides a powerful data storage solution for your desktop computer, laptop, Ultrabook™ or Chromebook™.
High capacity, high performance external storage
The dual drive enclosure lets you install two 2.5in SSDs or HDDs (from 5mm to 15mm) to create high capacity external data storage. To maximize the performance and speed of your SATA III (6Gbps) drives, the enclosure is enhanced with UASP delivering up to 70% faster transfer speeds than conventional USB 3.0. (See testing results below.)
Sleek, compact design with flexible power options
The compact design, small footprint and sleek finish make this enclosure the perfect desktop companion for your Mac or PC.
Requiring only 5V of power, you have the option to power the enclosure through USB alone, without the need for an external power adapter. It can be powered through a single or two USB sources, such as USB chargers or ports on your laptop, depending on your drive set-up. In stationary applications or configurations where more power is desired, a power adapter is included. The enclosure gives you a convenient, energy-efficient storage solution with flexible storage set-up options - and easy portability.
Increased performance and data redundancy with RAID
Enjoy peace of mind, knowing your files are continually backed up or take advantage of greater speed and capacity offered with a combined solution. The enclosure supports RAID 0, 1, Spanning, and JBOD, enabling you to choose your preferred backup mode. With the convenience of RAID, you can achieve increased size, performance, or redundancy.
The enclosure is compatible with Windows®, Mac®, Chrome OS™ and Linux® systems without having to install additional drivers or software.
Enhanced performance through UASP
This high-performance SuperSpeed USB 3.0 enclosure supports data transfer rates of up to 5Gbps and is enhanced with UASP support, which can deliver ~70% faster read speed and 40% faster write speed over traditional USB 3.0, when paired with a UASP-enabled host.
Note: UASP (USB Attached SCSI Protocol) is supported in Windows 8, 8.1, Server 2012 and Linux kernel 2.6.37 or later. Test results were obtained using an Intel® Ivy Bridge system, StarTech.com add-on USB 3.0 cards, a UASP-enabled StarTech.com enclosure, and a SATA III solid state drive.
The S252BU33R dual-bay enclosure is ruggedly built to deliver long-lasting performance, and is backed by a StarTech.com 2-year warranty and free lifetime technical support.
The StarTech.com Advantage
- Provides high capacity and high performance external storage
- Looks great next to your computer with a sleek, compact design
- Increases storage performance with RAID and UASP
Increase the external storage capacity of any computer by connecting this external storage enclosure
Take it with your laptop for on-the-go external storage
Add the security of data redundancy by using this enclosure with support for RAID
Backup or archive data from any USB computer
|Bus Type||USB 3.0|
|Chipset ID||JMicron - JMS561|
|Compatible Drive Types||SATA|
|Fan Bearing Type||Ball Bearing|
|Fans||1 - 40 mm|
|Number of 2.5 inch bays||2|
|Number of Drives||2|
|Supported Drive Height(s)||5mm|
|Hot Swap Capability||Yes|
|Max Drive Capacity||Currently tested with up to 2TB 7200 RPM hard drives (4 TB total)|
|Maximum Data Transfer Rate||USB 3.0 - 5 Gbps|
|Noise Level||21 dBA|
|Supported RAID Modes||RAID 0 (Striped Disks)|
|RAID 1 (Mirrored Disks)|
|JBOD - (Just a Bunch of Disks)|
|BIG (Spanning or Concatenation)|
|Type and Rate||USB 3.0 - 5 Gbit/s|
|SATA III (6 Gbps)|
|Drive Connectors||1 - SATA Data & Power Combo (7+15 pin) Receptacle|
|Host Connectors||1 - USB Type-B (9 pin) USB 3.0 Female|
|OS Compatibility||OS independent; No software or drivers required|
|LED Indicators||1 - Power LED|
|1 - HHD 1 Activity LED|
|1 - HHD 2 Activity LED|
|Input Current||0.4 A|
|Input Voltage||100 ~ 240 AC|
|Output Current||2 A|
|Output Voltage||5 DC|
|Power Consumption (In Watts)||3|
|Power Source||AC Adapter Included|
|Operating Temperature||0°C to 40°C (32°F to 104°F)|
|Storage Temperature||-10°C to 65°C (14deg;F to 149°F)|
|Enclosure Type||Aluminum and Plastic|
|Max Drive Height||0.6 in [15 mm]|
|Product Height||3.5 in [90 mm]|
|Product Length||5.2 in [132 mm]|
|Product Weight||12.4 oz [350 g]|
|Product Width||2 in [50 mm]|
|Shipping (Package) Weight||25.8 oz [730 g]|
|What's in the Box|
|Included in Package||1 - USB 3.0 Dual 2.5” SATA HDD/SSD RAID Enclosure|
|1 - USB 3.0 cable|
|1 - USB to Power Cable (Type H Barrel)|
|1 - Universal Power Adapter (NA/EU/UK/AU)|
|1 - Installation screw kit|
|1 - Quick install guide|
USB 3.0 / eSATA Dual-Bay Trayless 3.5” SATA III Hard Drive Enclosure with UASP - 2-Bay SATA 6 Gbps Hot-Swap HDD Enclosure
Connect two hot-swappable 3.5" SATA III hard drives to your computer externally through USB 3.0 with UASP or eSATA
Connect two 3.5" SATA III hard drives to your computer through USB 3.0 with UASP in a RAID array, and charge or connect USB devices with the built-in 2-port USB 3.0 fast charge hub
Create an external dual 3.5in HDD SATA RAID array, connected through either USB 3.0 with UASP or eSATA
Connect USB 3.0 devices, even in hard to reach areas and tight spaces
Connect your USB 3.0 devices with this high-quality USB 3.0 certified cable
Connect your USB 3.0 devices, with this high-quality USB 3.0 certified cable
Extend your USB 3.0 SuperSpeed cable by up to an additional 6 feet
Turn a 2.5” SATA HDD/SSD into a 3.5” SATA Drive
Turn Virtually any 2.5" SATA or SAS Hard Drive into a 3.5" SATA Drive
Frequently Asked Questions
Before You Buy
To determine if your hard drive will work in this enclosure, on the product page, click the Technical Specifications tab, and do the following:
- Make sure that the enclosure supports the storage size of your hard drive. If the storage size of your hard drive is larger than what the enclosure was tested with, the hard drive will likely still work with the enclosure.
- Confirm that your hard drive uses the same interface type as the enclosure. For example, IDE, SATA, or M.2.
- Make sure that the enclosure supports the physical size of your hard drive, such as 2.5 inches or 3.5 inches.
- Make sure that the enclosure supports the height of your hard drive. For example, 9 mm or 15 mm.
- Verify that the power consumption of your hard drive doesn’t exceed the power output of the enclosure. If you’re using multiple hard drives, make sure that the combined power consumption of all of the hard drives doesn’t exceed the power output of the enclosure.
Note: Not all StarTech.com devices support each of the RAID modes described below. For more information on the RAID modes that your device supports, refer to the manual or the StarTech.com product page.
Redundant Array of Independent Disks (RAID) is a virtual disk technology that combines multiple physical drives into one unit. RAID can create redundancy, improve performance, or do both.
RAID should not be considered a replacement for backing up your data. If critical data is going onto a RAID array, it should be backed up to another physical drive or logical set of drives.
The following are terms that are normally used in connection with RAID:
- Striping: data is split between multiple disks.
- Mirroring: data is mirrored between multiple disks.
- Parity: also referred to as a checksum. Parity is a calculated value used to mathematically rebuild data.
Different RAID levels exist for different application requirements.
Refer to the following table for the list of RAID modes offered by some StarTech.com products:
|RAID 0||Striped disks||Data is split evenly between two or more disks.||Large size and the fastest speed.||No redundancy.||If one or more drives fails, this results in array failure.|
|RAID 1||Mirrored disks||Two or more drives have identical data on them.||A single drive failure will not result in data loss.||Speed and size is limited by the slowest and smallest disk.||Only one drive is needed for recovery.|
|RAID 3||Striped set with dedicated parity||Data is split evenly between two or more disks, plus a dedicated drive for parity storage.||High speeds for sequential read/write operations.||Poor performance for multiple simultaneous instructions.||A single drive failure will rebuild.|
|RAID 5||Striped disks with distributed parity||Data is split evenly between three or more disks. Parity is split between disks.||Large size, fast speed, and redundancy.||The total array size is reduced by parity.||A single drive failure will rebuild.|
|RAID 10||1+0; Striped set of Mirrored Subset||Four or more drives are made into two mirrors that are striped.||Larger size and higher speed than RAID-1, and more redundancy than RAID-0.||No parity.||Only one drive in a mirrored set can fail.|
|JBOD||Just a Bunch Of Disks||Any number of drives are accessed independently by the operating system.||Software RAID modes can be used.||Hardware RAID may have better performance.||N/A|
|Big||Spanning or Concatenation||Data is written on one drive until it is full, and then the next drive(s) until it or they are full.||Creates a very large and simple array.||
|Clone||RAID 1 + Spare||
Two drives have identical data, plus one drive is used for rebuilding in case of a primary array failure.
|Seamless operation when one drive fails in a RAID-1 array.||Spare drive is not accessible to the user.||Only one drive is needed for recovery.|
When you troubleshoot issues with a hard drive enclosure, there are some quick tests that you can complete to rule out potential problems. You can test to make sure that the following components are working correctly and are not the source of the issue:
- Hard drives
- Hard drive enclosure
To test your setup components, try the following:
- Use the cables, hard drives, and hard drive enclosure in another setup to see if the problem is with the components or the setup.
- Use a different cable, hard drive, and hard drive enclosure in your setup to see if the problem persists. Ideally, you should test a component that you know works in another setup.
When you test the hard drive and hard drive enclosure, it is recommended that you do the following:
- To check Disk Management, press the Windows key + R, type diskmgmt.msc, and press Enter. Check to see if your hard drive is listed.
- If the hard drive is listed with unallocated space, the hard drive needs to be reformatted. Right-click unallocated and click New Simple Volume. Follow the on-screen instructions to complete the reformatting.
Note: Formatting a hard drive erases all of the data on it. Make sure that you back up all of your data before you reformat the hard drive.
- If the hard drive is listed as healthy but does not have a drive letter, for example, C:, right-click healthy and click Change Drive Letter and Paths. Click Add, assign a drive letter, and click OK.
Note: A formatted hard drive will not show up in Computer or My Computer until it has a drive letter assigned to it.
Note: Any data currently on the drives will be lost during this process. You need to back up all of your data before you set a RAID mode.
To set a RAID mode, complete the following:
- Turn off the hard drive enclosure.
- Set the RAID dip switches to the RAID mode that you want to set.
- Turn on the hard drive enclosure.
- Press and hold the Set button until the power LED turns red and the HDD1 and HDD2 LEDs start blinking.
In order to rebuild a RAID array, you need to replace a physical drive with an identical drive on the same RAID controller. Although standard RAID levels are generally agreed upon throughout the industry, the implementation varies between manufacturers. RAID arrays are typically not accessible when they are moved to another controller, and data may be unrecoverable if the drives are out of order or have been formatted or accessed by another RAID controller.
If a RAID controller has failed, you should get the exact same model of RAID controller.
Note: If a drive or drives were damaged, it is possible that the RAID array may be permanently unrecoverable.
RAID should not be considered a replacement for backing up your data. If critical data is going onto a RAID array, you should back up the data on another physical drive or logical set of drives.
Rebuild a RAID array
With the following RAID modes, recovery is possible using the same StarTech.com product. Refer to the following table for the appropriate method to use to recover your RAID array.
|RAID mode||Max # of failed drives||Procedure|
|RAID 1||Only one drive is needed for recovery.||
The array will rebuild and is accessible during the rebuilding process.
|RAID 3||Single drive failure will rebuild.||
Note: Do not change the order of the drives.
|RAID 5||Single drive failure will rebuild.||
Note: Do not change the order of the drives.
|RAID 10||Only one drive in a mirrored set can fail.||
Note: Do not change the order of the drives.
You should not upgrade your device's firmware if you do not have any issues with the functionality of your device. The only time you should consider an upgrade is if you are experiencing a problem with the device, and you have confirmed that the firmware addresses this problem. You can confirm this is the case by reviewing the documentation included with the firmware or by consulting with our Technical Support team. Incorrectly upgrading firmware can result in diminished performance so it is best to contact StarTech.com if you would like to perform this operation.
Compliance and Safety
- 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.