eSATAp / eSATA or USB 3.0 External 2.5in SATA III 6 Gbps Hard Drive Enclosure with UASP – Portable HDD / SDD

Turn a 2.5” SATA III HDD / SSD into an external hard drive that can connect to your computer through either eSATAp at 6 Gbps, or USB 3.0 with UASP at 5 Gbps

Product ID: S251SMU33EP

4 stars (1 reviews) |
  • Supports SATA III & UASP for optimal performance
  • eSATA or USB 3.0 interface options
  • Supports power over eSATA (eSATAp, eSATA/USB combo port) with no additional power adapter
Your price
$99.99 NZD excl. GST
$114.99 NZD incl. GST

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.

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.

UASP Speed Diagram

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

UASP Speed Diagram

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

Applications

  • Take advantage of laptops and desktops that feature eSATA connectivity
  • Create a fast, portable external storage solution for Ultrabooks, laptops or Chromebooks
  • Add extra storage to any USB/eSATA-enabled computer system
  • Back up important data to an external storage device
  • Share large files between computers quickly and securely without a network connection
  • Retrieve data from your SATA drive, or turn your unused drive into additional external storage space

The StarTech.com Advantage

  • Versatile connectivity options, through either USB or eSATA/eSATAp
  • Maximum portability with a small footprint, and support for eSATAp (no external power adapter required)
  • Save time, with file transfers up to 70% faster than traditional USB 3.0 when used with a UASP-supported host

Partner Numbers

  • Ingram Micro New Zealand 2789028
  • UPC 065030859219

Compatibility

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

Specifications

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
Hardware Interface eSATA
Bus Type USB 3.0 & eSATA
Interface USB 3.0
USB 3.0 & eSATA
Number of Drives 1
Drive Size 2.5in
Compatible Drive Types SATA
Drive Installation Fixed
Number of 2.5 inch bays 1
Fan(s) No
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
UASP Support Yes
TRIM Support Yes
4Kn Support Yes
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]
Color Silver
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]
Power Power Source USB-Powered
Plug Type H
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
eSATA cable
Installation screws (with screw driver)
Phillips head screw driver
USB to DC power adapter
Instruction manual

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Drivers/Downloads

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Manual(s):

Datasheet

Product Support

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Frequently Asked Questions

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.

Before You Buy

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:

  • 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.

Hard Drives

Windows 10 

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).

Initialize a drive

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.

  1. Press the Windows key + R, type compmgmt.msc, and click Run to open Computer Management.

  2. Navigate to Disk Management.

  3. 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.

  4. Click OK.

Create a partition in a drive

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.

  1. Right-click Unallocated or RAW volume, and select New Simple Volume.

  2. In the New Partition Wizard, click Next.

  3. Select Primary partition.

  4. Leave the partition size set to default, and click Next.

  5. Assign a drive letter or leave it set to the default, and click Next.

  6. Enter the following settings to format the partition:

  • In the File System field, enter NTFS.
  • Set the Allocation unit size to Default.
  • In the Volume label field, enter <your name/reference>.
  • Select the Perform a quick format check box.
  • Clear the Enable file and folder compression check box.
  1. Click Next > Finish.

The new drive should appear in Windows Explorer.

Mac OS

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).

Initialize a drive

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.

Create a partition on a 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:

  1. Open Finder.

  2. Navigate to Applications and click Utilities.

  3. Open Disk Utility.

  4. Select the new drive and click the Partition tab.

  5. Click Options and verify that it is set to GUID Partition Table.

  6. Enter a name for the partition.

  7. Click Partition.

The drive should now be accessible in Finder.

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Compliance and safety

Compliance letters

  • WEEE
    • Language: English
  • RoHS
    • Language: English

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

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(4 Stars)

Works great, but no eSATAp cable included

By: GeoffT - 05/27/2017
The drive works as expected with the exception that it doesn't come with an eSATAp cable which was the whole point of buying this product. It would have been nice to have it included or at least a somewhat prominent statement that it's not included so that I could have ordered it at the same time instead of waiting an additional week to to get my final solution.
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