"I want to make an entire copy of my Toshiba USB flash drive to another flash drive with the same type. Tried Disk Utility, but the cloning process always failed when selecting the destination disk. What's the other way of cloning a flash drive I should take?"
You can achieve the cloning purpose on Mac by using Disk Utility, and the right steps to use Disk Utility should be like this.
Select and drag destination disk to the Destination entry field. Next, select and drag the source disk to the Source entry field, and double click to go.
If you prefer a more straightforward way of cloning a USB flash drive to another, simply download Qiling Backup for Mac. It's considered as the fastest way by customers to clone files, pictures, applications along with settings and even operating system on a bootable USB flash drive to a destination storage device.
Ease of use is the biggest advantage of using Qiling mac cloning software to perform cloning job than that of Disk Utility, what's more, the guarantee of less chance of disk cloning failure, hanging or stuck.
Be aware that Qiling Backup for Mac can run seamlessly on Mac OS X versions starting from 10.9 to the latest macOS Sierra. Now, connect both your USB flash drives using the USB ports to the Mac computer and follow the guide to get started.
Step 1. Select the disk clone feature which is the fourth option at the top left corner on the main window of Qiling Backup for Mac.
Step 2. In the drop-down list, select the USB flash drive as the source disk you want to clone.
Step 3. In the drop-down list, select the other empty USB flash drive as the destination disk.
Step 4. Set up the disk cloning properties. Here, you are allowed to exclude files or folders if necessary.
Step 5. Finally, click the Start button to execute the cloning operation.