Product ID: S251SMU33EP
The S251SMU33EP USB 3.0 / eSATAp drive enclosure turns a 2.5in SATA hard drive (HDD) or solid state drive (SSD) into an external portable hard drive that can connect to any USB or eSATA-enabled computer system.
For fast performance and efficient data transfers when connected through eSATA, the enclosure supports full SATA III transfer speeds -- up to 6 Gbps. For universal compatibility, the S251SMU33EP can be connected through USB 3.0 with transfer speeds up 5 Gbps plus support for UASP, which delivers performance up to 70% faster than conventional USB 3.0 when paired with a UASP-enabled host controller to utilize the full potential of your SATA III hard drives. See our UASP testing results below for further details.
Designed for maximum portability, the S251SMU33EP doesn't require an external power adapter when connected to an eSATAp (USB + eSATA combo) host port.
The 2.5in enclosure supports the fastest drive technologies including SATA III (6 Gbps), hybrid drives and solid state drives (SSD), saving you time by ensuring you're getting the most out of your drive performance.
To ensure compatibility with your computer system, the S251SMU33EP supports all of the leading operating systems, including: Microsoft Windows®, Apple® OSX, Linux, and Google Chrome OS™.
The S251SMU33EP is backed by a StarTech.com 2-year warranty and free lifetime technical support.
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 StarTech.com Enclosure, and a SATA III solid state drive.
|Warranty Information||Warranty||2 Years|
|Connector(s)||1 - Drive Connectors||SATA Data & Power Combo (7+15 pin)|
|1 - Host Connectors||Power eSATA (11 pin, eSATA/USB, 5V)|
|USB 3.0 Micro-B (10 pin, SuperSpeed)|
|Environmental||Operating Temperature||0°C to 40°C (32°F to 104°F)|
|Storage Temperature||-10°C to 65°C (14°F to 149°F)|
|Humidity||Operation Humidity: 10% ~ 90% RH
Storage Humidity: 5% ~ 95% RH
|Bus Type||USB 3.0 & eSATA|
|USB 3.0 & eSATA|
|Number of Drives||1|
|Compatible Drive Types||SATA|
|Number of 2.5 inch bays||1|
|Chipset ID||ASMedia - ASM1153E
ASMedia - ASM1456
|Indicators||1 - LED Indicators||Power/Activity|
|Packaging Information||Package Height||1.7 in [42 mm]|
|Package Length||5.3 in [13.5 cm]|
|Shipping (Package) Weight||9.8 oz [278 g]|
|Package Width||7.0 in [17.9 cm]|
|Performance||Maximum Data Transfer Rate||6 Gbps - eSATA
5 Gbps - USB 3.0
|Type and Rate||USB 3.0 - 5 Gbit/s|
|Type and Rate||eSATA (6 Gbps)|
|Max Drive Capacity||Currently tested with up to 2TB 7200 RPM hard drives|
|Physical Characteristics||Weight of Product||3.5 oz [98 g]|
|Material||Aluminum and Plastic|
|Max Drive Height||0.4 in [9.5 mm]|
|Product Length||4.9 in [12.5 cm]|
|Product Width||3.0 in [77 mm]|
|Product Height||0.6 in [16 mm]|
|Software||OS Compatibility||OS independent; No software or drivers required|
|Special Notes / Requirements||Note||Windows 7 and earlier Windows versions do not support TRIM with USB to SATA devices.|
|What's in the Box||1 - Included in Package||USB 3.0/eSATAp 2.5" SATA Hard Drive Enclosure|
|USB 3.0 Cable|
|Installation screws (with screw driver)|
|Phillips head screw driver|
|USB to DC power adapter|
Connect your external SATA storage devices to your Laptop or desktop.
Connect a USB 3.0 Micro USB external hard drive to your computer
Position your USB 3.0 Micro devices near your desktop or laptop computer easily, with a thin, more flexible cable
Connect your Micro-B USB 3.0 devices, with this high-quality USB 3.0 certified cable
Connect a USB 3.0 Micro USB External Hard drive to your computer
Add Two eSATA 3.0 (6Gbps) Ports for High Speed Access to Large External Storage Solutions
Add 2 external or internal SATA 6 Gbps ports to a computer, through a PCI Express slot
Add external and internal 6 Gbps SATA 3.0 ports for high speed storage access
Add 2 SuperSpeed USB 3.0 ports to your PCI Express-enabled PC
Add 4 external USB 3.0 ports to a low profile or standard computer, through PCI Express
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:
To test your setup components, try the following:
When you test the hard drive and hard drive enclosure, it is recommended that you do the following:
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.
Note: A formatted hard drive will not show up in Computer or My Computer until it has a drive letter assigned to it.
Hard drive enclosures require power from your system's USB port. Although you can plug in any standard SATA drive, USB ports only supply a limited amount of power and are not able to power all of the hard drives plugged into the system.
The power capabilities of the USB port combined with the power requirements of the attached hard drive will determine if the hard drive enclosure will work in your setup. The power (in mA) supplied by the USB port must be greater than the requirements of the hard drive.
A USB 2.0 port can supply a maximum of 500 mA (0.5 A), and a USB 3.0 port can supply a maximum of 900 mA (0.9 A).
You can usually find the power requirements of your hard drive in the technical specifications on the label of the hard drive or on the manufacturer's website.
To determine if your hard drive will work in this enclosure, on the product page, click the Technical Specifications tab, and do the following:
Before you can access a new or formatted drive in your operating system, you need to initialize it first and then create a partition on the drive. A partition defines an area of the drive to use for storing data. The partition uses a file system (for example, ex-FAT, NTFS, and so on).
Note: You typically only need to initialize a drive if the drive is new. If you cannot find an uninitialized drive in Disk Management, skip the following steps and try to partition your device.
Press the Windows key + R, type compmgmt.msc, and click Run to open Computer Management.
Navigate to Disk Management.
When prompted to, initialize your disk(s). If you are running Windows® 7 or later and are using a drive larger than 2TB, initialize the disk(s) with GPT. If you are running an earlier version of Windows, initialize the disk(s) with MBR. For more information, visit the following FAQ: https://www.startech.com/support/faqs/technical-support?topic=hard-drives#mbr-vs-gpt.
Note: The following steps create an NTFS partition that uses the entire drive space. To use a different file system, select a different option in step 6.
Right-click Unallocated or RAW volume, and select New Simple Volume.
In the New Partition Wizard, click Next.
Select Primary partition.
Leave the partition size set to default, and click Next.
Assign a drive letter or leave it set to the default, and click Next.
Enter the following settings to format the partition:
The new drive should appear in Windows Explorer.
Before you can access a new or formatted drive in your operating system, you need to initialize it first and then create a partition on the drive. A partition defines an area of the drive to use for storing data. The partition uses a file system (for example, HFS+, ex-FAT, NTFS, and so on).
Mac OSX detects a drive that needs to be initialized and automatically prompts you to initialize the drive. If you are prompted to initialize the drive, click Initialize. If you are not prompted to initialize the drive and you cannot find the drive in Finder, you will need to create a partition on the drive.
Note: The following steps create an HFS+ (Mac OS Extended (Journaled)) partition that uses the entire drive space.
To create a partition on a new drive, complete the following:
Navigate to Applications and click Utilities.
Open Disk Utility.
Select the new drive and click the Partition tab.
Click Options and verify that it is set to GUID Partition Table.
Enter a name for the partition.
The drive should now be accessible in Finder.
For products related to this article, click here.
Check out our review guidelines.