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2bay HDD RAID Enclosure With Uasp USB 3 SATA Enclosure / Mfr. No.: S3520bu33er

2bay HDD RAID Enclosure With Uasp USB 3 SATA Enclosure / Mfr. No.: S3520bu33er
Qty. Available: 8
Item Number: sta-s3520bu33er
Vendor Number: S3520BU33ER
Vendor: Startech.Com
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Create an external dual 3.5in HDD SATA RAID array, connected through either USB 3.0 with UASP or eSATA. The S3520BU33ER 2-Bay RAID Enclosure offers a high-performance external storage solution, enabling you to build a secure RAID array with two 3.5" SATA hard drives, with the option to connect it to your computer through either an available USB 3.0 or eSATA port.

For fast data transfers and efficient performance from your SATA III drives, the RAID enclosure supports full SATA III transfer speeds (up to 6 Gbps), as well as full USB 3.0 transfer speeds (up to 5Gbps). When connected through USB, the enclosure supports UASP, which offers performance up to 70% faster than conventional USB 3.0 when paired with a UASP-enabled host controller (see our performance below).

With support for JBOD, Spanning, RAID 0, and RAID 1,the enclosure offers several options that enable you to customize your drive arrangement based on your storage requirements.

To maximize both durability and reliability, the external RAID enclosure features high-quality aluminum construction with a built-in fan that helps improve ventilation and maintain a better operating environment for your drives.

The HDD enclosure offers a versatile solution for increasing the storage/backup capabilities of your computer, with support for large capacity hard drives (tested up to 4TB), and is backed by a 2-year warranty and free lifetime technical support.

Improved Performance with UASP

UASP is supported in Windows 8, Mac OSX (10.8 or above), and Linux. In testing UASP performs with a 70% faster read speed and 40% faster write speed over traditional USB 3.0 at peak performance.

At the same peak in testing UASP also shows an 80% reduction in required processor resources.

Testing results were obtained using an Intel® Ivy Bridge system, a UASP enabled Enclosure, and a SATA III solid state drive.

General Information
Manufacturer Part NumberS3520BU33ER
Manufacturer Website Address
Product NameUSB 3.0/eSATA HDD RAID Enclosure
Product TypeDAS Array


Number of Hard Drives Supported2
Number of Hard Drives InstalledNo


Controller TypeSerial ATA/600
RAID Levels0, 1, Concatenation, JBOD

I/O Expansions

Number of Total Expansion Bays2
Number of 5.25" BaysNo
Number of 3.5" Bays2
Number of 2.5" BaysNo
Number of 2.5"/3.5" BaysNo


Drive InterfaceeSATA

Power Description

Power SourceAC Adapter

Physical Characteristics

Form FactorExternal
Weight (Approximate)2.16 lb


Platform SupportedMac
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