SyncStation Marshmallow 2.5” USB3.0 to SATA6G 2.5" Docking Station with UASP Function

The drive may be damaged. Test with a known-working drive, or test the drive directly to a PC.
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.
If the drives came from a RAID (Redundant Array of Independent Disks), they would not be accessible in our docking stations.
If the drive uses 4Kn sectors, check the technical specifications of the docking station, and ensure it can read 4Kn drives.

You do not need to format your target hard drive before you begin to duplicate it, because the target hard drive is automatically overwritten during the duplication process.

You can use this device to duplicate an internal hard drive with the stand alone duplicator function if you remove the hard drive from the computer and connect it directly to this device.

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

Press the Windows key+R, type devmgmt.msc, and press Enter.
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.

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.

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.

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.

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:

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.
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:

Open Finder.

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.

Click Partition.

The drive should now be accessible in Finder.