StarTech.com

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

  • Create a powerful external USB 3.0 storage solution, supporting two 2.5" SSD or HDD drives
  • Sleek, compact design works beautifully with your Mac or PC
  • Transfer files quickly with SATA III (6Gbps) power and USB 3.0 with UASP
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  • Achieve enhanced performance and data redundancy with RAID 0,1, spanning and JBOD
  • Requires only 5V power, allowing flexible power options
  • Works with Windows, Mac, Chrome and Linux (2.4.x and up) systems
  • Easy set-up with no additional drivers and software required
$155.99 NZD exc GST
$179.39 NZD inc GST
Not Available
May be in stock with partners
Where To Buy

For more products like this please visit our International online store today!

Overview

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

With its compact design and small footprint, this high performance 2-bay enclosure occupies minimal space in your work area

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.

UASP speed benefit diagram

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

Applications

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

Technical Specifications

Warranty Information
Warranty 2 Years
Hardware
Bus Type USB 3.0
Chipset ID JMicron - JMS561
Compatible Drive Types SATA
Drive Installation Fixed
Drive Size 2.5in
Fan Bearing Type Ball Bearing
Fan(s) Yes
Fans 1 - 40 mm
Interface USB 3.0
Number of 2.5 inch bays 2
Number of Drives 2
Supported Drive Height(s) 5mm
7mm
9.5mm
12.5mm
15mm
Performance
4Kn Support Yes
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
RAID Yes
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)
UASP Support Yes
Connector(s)
Drive Connectors 1 - SATA Data & Power Combo (7+15 pin) Receptacle
Host Connectors 1 - USB Type-B (9 pin) USB 3.0 Female
Software
OS Compatibility OS independent; No software or drivers required
Indicators
LED Indicators 1 - Power LED
1 - HHD 1 Activity LED
1 - HHD 2 Activity LED
Power
Input Current 0.4 A
Input Voltage 100 ~ 240 AC
Output Current 2 A
Output Voltage 5 DC
Plug Type H
Power Consumption (In Watts) 3
Power Source AC Adapter Included
Environmental
Humidity 10~90% RH
Operating Temperature 0°C to 40°C (32°F to 104°F)
Storage Temperature -10°C to 65°C (14deg;F to 149°F)
Physical Characteristics
Color Black
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]
Packaging Information
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
Supports any operating system.
No additional drivers or software required.

Certifications

Related Products

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
S352BU33RER
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

$259.99 exc GST
$298.99 inc GST

Accessories

Product Support

Drivers & Downloads

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 mode Description Operation Advantages Disadvantages Recovery
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.

No redundancy.

N/A
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.

 

Troubleshooting

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:

  • Cables
  • 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:

  1. Turn off the hard drive enclosure.
  2. Set the RAID dip switches to the RAID mode that you want to set. 
  3. Turn on the hard drive enclosure.
  4. 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.
  1. Determine which drive is operational by using the RAID management utility (if available) or test each drive individually on a different hard drive controller (for example, a hard drive docking station or SATA controller).

  2. Replace the failed drive with an identical hard drive.

The array will rebuild and is accessible during the rebuilding process.

RAID 3 Single drive failure will rebuild.
  1. Determine which drive is defective by using the RAID management utility (if available) or with diagnosis LEDs on the controller or enclosure.

  2. Replace with an identical hard drive.

Note: Do not change the order of the drives.

  1. The array may be accessible during the rebuild, but you should let the controller rebuild without interruption so that performance is not compromised.

RAID 5 Single drive failure will rebuild.
  1. Determine which drive is defective by using the RAID management utility (if available) or with diagnosis LEDs on the controller or enclosure.

  2. Replace with an identical hard drive.

Note: Do not change the order of the drives.

  1. The array may be accessible during the rebuild, but you should let the controller rebuild without interruption so that performance is not compromised.

RAID 10 Only one drive in a mirrored set can fail.
  1. Determine which drive is defective by using the RAID management utility (if available) or with diagnosis LEDs on the controller or enclosure.

  2. Replace with an identical hard drive.

Note: Do not change the order of the drives.

  1. The array may be accessible during the rebuild, but you should let the controller rebuild without interruption so that performance is not compromised.

 

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.