Copying files from oneUSBto another can cause errors.

Reduction of speed when you copy large files of more than 4GB size.

Motherboard can have USB 2.0 configuration.

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Two external USB hard-disks can have data on each of them.

But if the files or folders are too large, then the copying process may become slow.

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This issue can be resolved in a more crude way.

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This way, it will take a lot of time to complete the copy process.

The best way to solve this slow copy problem is to use a USB 3.0 PCI-E card or adapter.

Your motherboard should support it.

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Generally they have 2 or 4 ports.

So you should be able to connect both your USB external drives to it.

Then it’s possible for you to copy files/folders from each of them.

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Speed will be 4x times faster than USB 2.0.

Then you might use tools like Robocopy or Teracopy to transfer files one disk to another.

https://support.microsoft.com/en-us/help/908673/problems-may-occur-when-you-try-to-transfer-files-to-or-from-a-gear

This can generally occur if you are usingolder OS like Windows XP or Vista or 7.

To deal with the above kind of error in Win 7, you could following this solution.

The external USB hard-disk or pen-drive may be using FAT32 file system.

The maximum file size in this kind of file system is 4GB.

To solve this error you’re able to do the following.

This also does the similar functionality as the above command.

It can have different solutions.

https://help.2brightsparks.com/support/solutions/articles/43000335897

To fix this in Windows 10, stick to this.

File Splitter, WinZip kind of tools split the file into many parts.

you might decide the size of each individual part.

Then a small executable can merge all the individual parts.