USB 3.1 (10Gbps) Dual-Bay Dock for 2.5"/3.5" SATA SSD/HDDs

Dock two of your 2.5” and 3.5” SATA drives over high performance USB 3.1 Gen 2 with UASP

Product ID: SDOCK2U313

4 stars (6 reviews) |
  • Access data from two 2.5/3.5” SATA SSD/HDDs over ultra-fast USB 3.1 Gen 2
  • Support for SATA I, II and III (up to 6 Gbps)
  • USB Type A interface for backward compatibility with USB 3.0, 2.0 and 1.x
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USB 3.0 / eSATA Dual Hard Drive Docking Station with UASP for 2.5/3.5in SATA SSD / HDD – SATA 6 Gbps
USB 3.0/eSATA Dual HDD/SSD Dock w/ UASP
Easily connect and swap two 2.5 or 3.5in SATA III drives through eSATA or USB 3.0

Get unprecedented performance and storage capacity with this USB 3.1 Gen 2 (10 Gbps) dual-drive docking station. It supports both 2.5” and 3.5” form factor solid-state and hard drives, with a high capacity storage capability of 12TB (6TB per drive).

Harness the speed of USB 3.1 Gen 2

USB File Transfer Rates diagram shows USB 3.1 Gen 2 at 10 Gbps is twice the speed of USB 3.0  at5 Gbps

USB 3.1 Gen 2 gives you greater bandwidth and speed with file transfer rates of up to 10 Gbps - twice the speed of USB 3.0 (USB 3.1 Gen 1) technology. It lets you leverage the high performance of the latest SSDs and hard drives, while alleviating bottlenecks in your data transfers.

Top-loading design for easy drive access

Top-loading design allows easy access to your drives

It’s never been easier to dock and swap drives from your desktop computer or laptop. Simply insert your drives into the top loading slot, with no tools or trays required. The HDD ejection button allows fast and simple drive removal.

Convenient compatibility

The dual-drive docking station comes with a USB Type-A to B cable, providing backward compatibility with your existing USB 3.0, 2.0 and 1.x devices.  It also supports UASP for enhanced performance.

Extend the value of this hard drive docking station further with the addition of our SATA to IDE Hard Drive Adapter (SAT2IDEADP), allowing easy insertion of any 2.5” or 3.5” IDE hard drive into a SATA hard drive dock.

The SDOCK2U313 is backed by a 2-year warranty and free lifetime technical support.


  • Perfect for system builders and IT professionals who need quick access to drives for imaging
  • Back up data quickly to an external drive for archiving
  • Transfer data from one hard drive to another
  • Convenient for technicians who test or benchmark multiple hard drives
  • Easily take backup data to an offsite location for safekeeping

Partner Numbers

  • UPC 065030861663


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


Warranty Information Warranty 2 Years
Connector(s) 2 - Drive Connectors SATA Data & Power Combo (7+15 pin)
1 - Host Connectors USB 3.1 USB Type-B (9 pin, Gen 2, 10 Gbps)
Environmental Operating Temperature 5°C to 35°C (35°F to 95°F)
Storage Temperature -20°C to 50°C (-4°F to 122°F)
Humidity 20% ~ 80% RH
Hardware Interface USB 3.1 Gen 2
Bus Type USB 3.1 Gen 2
Number of Drives 2
Drive Size 2.5in & 3.5in
Compatible Drive Types SATA
Drive Installation Removable
Number of 2.5 inch bays 2
Number of internal 3.5 inch bays 2
Fan(s) No
Chipset ID ASMedia - ASM1352R
Indicators 1 - LED Indicators Power
2 - LED Indicators HDD Activity
Packaging Information Package Height 4.7 in [12 cm]
Package Length 8.3 in [21 cm]
Shipping (Package) Weight 34.6 oz [980 g]
Package Width 7.5 in [19 cm]
Performance Maximum Data Transfer Rate 10 Gbps
Type and Rate USB 3.1 Gen 2 - 10 Gbit/s
UASP Support Yes
4Kn Support Yes
Type and Rate SATA III (6 Gbps)
TRIM Support Yes
Max Drive Capacity Currently tested with hard drives up to 6TB at 7200 RPM
Physical Characteristics Weight of Product 17.7 oz [502 g]
Color Black
Material Plastic
Product Length 5.2 in [13.2 cm]
Product Width 5.8 in [14.8 cm]
Product Height 2.8 in [7 cm]
Power Power Source AC Adapter Included
Input Voltage 100 - 240 AC
Input Current 1.3A
Output Voltage 12V DC
Output Current 3000 mA
Center Tip Polarity Positive
Plug Type M
Power Consumption (In Watts) 36
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 3.1 Dual-drive HDD Dock
USB 3.1 A-to-B Cable - 41 inches
Universal Power Adapter - 49.5 inches (cable)
Quick Install Guide
4 - Included in Package Power Adapter Plugs (NA/EU/UK/AUS)


Talk to an Advisor

We are always ready to assist you with any questions you may have.

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Product Support

Talk to an Advisor

We are always ready to assist you with any questions you may have.

Live Chat (opens in new window)

Frequently Asked Questions


  1. The drive may be damaged. Test with a known-working drive, or test the drive directly to a PC.
  2. The operating system on the computer may not support reading and writing to the file system on the docked hard drive or SSD.  Remember, Windows cannot read Mac or Linux file systems. Also, macOS can read but not write to NTFS drives.
  3. If the drives came from a RAID (Redundant Array of Independent Disks), they would not be accessible in our docking stations.
  4. If the drive uses 4Kn sectors, check the technical specifications of the docking station, and ensure it can read 4Kn drives.

When you troubleshoot issues with a hard drive dock or duplicator, 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:

  • IDE, SATA, and eSATA cables
  • Hard drives
  • Hard drive dock or duplicator

To test your setup components, try the following:

  • Use the cables, hard drives, and hard drive dock or duplicator in another setup to see if the problem is with the components or the setup.
  • Use a different cable, hard drive, and hard drive dock or duplicator 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 dock or duplicator, it is recommended that you do the following:

Note: For a hard drive duplicator you may need to switch the device to PC mode (if available).

  1. To check Disk Management, press the Windows key + R, type diskmgmt.msc, and press Enter. Check to see if your hard drive is listed.
  2. Do one of the following:
  • 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.

This docking station allows the hard drive to enforce its own power state, as opposed to enforcing a power state that keeps the hard drive active at all times. Since most newer hard drives have low-power energy conservation modes, this will cause the hard drive to enter an idle state if it is not used for a certain amount of time. 


If your setup components support USB 3.1 but you are experiencing slower transfer speeds than you expected, consider the following:

  • A USB host connection with multiple USB 3.1 ports might not be able to support 10Gbps on each port simultaneously.
  • The type of port on a device does not determine whether the device is capable of USB 3.1 speeds. A USB-C port might not support USB 3.1 speeds, while USB-A and USB-B ports might support USB 3.1 speeds.
  • Any other devices that you include in your setup, such as an older hard drive in a USB 3.1 enclosure, might create a point of congestion and slow down transfer speeds.

To confirm the functionality of your USB host connection, its ports, and any other devices in your setup, refer to the information provided by the manufacturer.

Note: USB 3.1 is also known as USB 3.1 Gen 2 (10Gbps). Devices that support USB 3.1 should have the USB 3.1 symbol on them. If the USB 3.1 symbol does not appear on your USB source or device, refer to the information provided by the manufacturer to confirm whether the USB source or device support USB 3.1.

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 if you would like to perform this operation.

How To

To confirm that Windows detects your USB device, complete the following:

  1. Press the Windows key+R, type devmgmt.msc, and press Enter.
  2. In Device Manager, under the appropriate heading, confirm that your expansion card is listed and that there isn't an exclamation mark next to it.  For example, a USB controller card would be under Universal Serial Bus controllers.

Your USB device is listed according to the name of the chipset. To determine the name of the chipset of your USB device, navigate to and look on the Technical Specifications tab for your product.

To confirm that the Mac OS detects your USB device, complete the following:

  1. Click the Apple icon.
  2. Click About This Mac.
  3. Click More Info or System Report.
  4. Under the appropriate heading, confirm that your USB device is listed and that there isn't an error. For example, a network card would be under Ethernet Cards.

You may need to refresh the System Information page after you plug in your device.  To do so, press Command R with the System Information page open.

Your USB device is listed according to the name of the chipset. To determine the name of the chipset of your USB device, navigate to and look on the Technical Specifications tab for your product.

Before You Buy

Yes, this device supports the TRIM command. If the OS issues a TRIM command, the command will be passed to the connected device.

To determine if your hard drive will work in this device, on the product page, click the Technical Specifications tab, and do the following:

  • Make sure that the device supports the storage size of your hard drive. If the storage size of your hard drive is larger than what the device 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 device. For example, IDE, SATA, or M.2.
  • Make sure that the device supports the physical size of your hard drive, such as 2.5 inches or 3.5 inches.
  • Verify that the power consumption of your hard drive doesn’t exceed the power output of the device. 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 docking station.

USB 3.1 is the most recent version of the USB (Universal Serial Bus) standard for connecting computers and electronic devices. It is capable of data transfer speeds up to 10Gbps, and while it can use the USB-C connector type, it can also use a variety of other connector types. To achieve USB 3.1 transfer speeds, your USB host connection, cables, and device must all support USB 3.1. USB 3.1 is also known as USB 3.1 Gen 2 (10Gbps). 

USB 3.0 is capable of data transfer speeds up to 5Gbps. USB 3.0 is also known as USB 3.1 Gen 1 (5Gbps).

USB 3.1 is backwards compatible with USB 3.0 and USB 2.0, except in the following scenarios:

  • USB-B 3.1 cables are not compatible with USB-B 2.0 ports.
  • Unless you use an adapter, USB-C ports or cables will not work with USB-A or USB-B ports or cables.
  • Devices that require USB 3.1 transfer speeds of 10Gbps might not work with USB 3.0 or USB 2.0, or you might experience lower transfer speeds and impacted performance.
  • Bus-powered USB devices that requires more power than what USB 2.0 can provide are not compatible with USB 2.0.

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To transfer data at speeds of 10Gbps, you need to confirm that the following components in your setup support USB 3.1:

  • The USB host connection
  • The USB cable
  • The USB device and any subcomponents (for example, a hard drive docking station and the hard drives in the docking station)

Note: USB 3.1 is also known as USB 3.1 Gen 2 (10Gbps). Devices that support USB 3.1 should have the USB 3.1 symbol on them. If the USB 3.1 symbol does not appear on your USB source or device, refer to the information provided by the manufacturer to confirm whether the USB source or device support USB 3.1.

The included USB cable for this USB 3.1 Gen 2 device has been tested and verified to perform at USB 3.1 Gen 2 speeds of 10Gbps.

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:

  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

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

(6 reviews)
4 out of 5 stars
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1 - 6 of 6 Reviews
(4 Stars)
By: dan2017 - 07/13/2017
does not come with a usb 3.1 gen 2 cable both, the usb and power cable, are too short otherwise this unit is very easy to setup an use.
| Helpful?
Nick, Customer Support on 7/14/2017 1:59:45 PM
Hi, Thanks for sharing your review of our SDOCK2U313. We apologize for the issue you've experienced, and we want to help. The USB cable that comes with this dock is USB 3.1 gen 2. If you believe that you received an incorrect cable we would be happy to look into the problem and send you the correct cable if needed! Please contact us at 1-800 265-1844 at your earliest convenience. Thank you,
(3 Stars)

Fast dock but missing cloning feature

By: stormythecat - 07/31/2018
I never would have guess that StarTech would have a dual dock without cloning functionality - but that's what this is. It's a very fast dock but lacking a crucial feature!
| Helpful?
Nick, Customer Support on 7/31/2018 3:01:43 PM
Hi Steven, thank you for the feedback! You are correct that the SDOCK2U313 does not come with a cloning function. This product is designed for connecting drives to a computer via USB. If you are looking for a drive dock with the cloning feature, we recommend our SDOCK2U313R. This is the same dock with extra functionality built into it to allow cloning. If you have any further questions or ever need help with finding the right product for your needs, you can reach one of our Technical Advisors at 1-800 265-1844 or
(3 Stars)


By: lajoes - 12/01/2018
I use this as an external HDD holder for 2 12TB. I am consolidating my video collection from various older HDD's. On occasion this involves using the adapter for old Serial HDD's. I have two of these units, one for each laptop and they are reliable. I haven't tried the clone feature yet as I am still coping everything to my new HDD's. Once I have the masters done, then I'll clone them so I'll always have a back up. But my biggest complaint is the transfer speed for a unit that is supposed to be 10GB. Nowhere near it. I get avg 32-45 MB/s on a good day. Most of the time is 5-16 MB/s. It is more like a 2.5/3.0 transfer speed with the supplied short cables. I have a Seagate 4TB & 5TB Backup Plus that gives 145+MB/s. That's because they are using the right cables (marked with Super USB (double SS) 10) . I believe they are type C and micro type B. Startech needs to drastically update the connections in order to obtain the higher transfer speeds.
| Helpful?
Stefan , Customer Support on 12/4/2018 4:10:18 PM
Hi! Thank you for your review of our dock! We sorry to hear that the dock is performing slower than expected, those speeds are definitely lower than normal. The included cable is able to provide the full speed the dock can maintain, and even though the dock is rated for 10Gb/s, SATA III, the fastest drive speed currently, can only do 6Gb/s at top performance. This is also heavily dependent on the drives you use as older spinning drives (Non-SSDs) may not consistently hit their full speed, or may be SATA II or SATA I which have a lower data rate. Also, running our dock through a hub or other devices may impact speed as well. Since the speeds are not at where we expect them, we would like to hear more about your setup to troubleshoot the issue. You can always contact our support team 24 hours a day 5 days a week at or 1 800 265 1844 for any product related issues. A member of our Technical Advisory team will be reaching out to you shortly by email to assist! Thank you,
(5 Stars)

10 Gbps USB with new Mac mini

By: joe5151 - 01/23/2019
Just purchased this dock. It connects at 10 Gbps USB with my new Mac mini (Late 2018), as shown on "System Summary" ---> "USB". My two drives are WD RED SATA III, 2 GB each. Performance is great and much faster read/write than before. My 3 1/2 inch big, heavy disks could use better mechanical support though.
| Helpful?
(5 Stars)

Reliable and fast

By: MikeD - 08/29/2020
I bought one years ago and can't believe I am the first to review. It works flawlessly and I use it whenever I want to clone a drive. Can also boot from it if drive is converted (it seconds) with the free Haslo WinTo USB. Click Tools, and use first option to convert.
| Helpful?
(4 Stars)

Not Gen 2 compatible

By: - 11/11/2021
This dock does not work for me on USB 3.1 Gen 2. Works fine Gen 1. Tried two differsnt system that both support Gen 2 USB. If I plug into this port the activity light constantly flashes but the drive is never recognized. Yes, I am using the supplied cable.
| Helpful?
Atha, Customer Support on 11/15/2021 9:18:21 PM
We are sorry to hear that you experienced difficulty with SDOCK2U313. This is not expected behavior for our USB 3.1 Gen 2 dual bay dock. Our Technical Advisors will be reaching out to you shortly.
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