External drives are basically "plug and play". On a Windows PC a new entry will appear under This PC -> Devices and drives. This is visible after opening File Explorer, or any folder on windows. Older versions of Windows like Vista or 7 may have a PC icon on the desktop.
Once you select the drive from file explorer simply drag and drop files from other places. Please keep in mind that speed of transfers depend on your port's specs.
In the event that the drive doesn't show on your PC try the following:
- Use another port. Sometimes a port fails to supply enough power or is defective
- Another USB cable.
- Ensure that the LED is active
- Check Device Manager to see if it's listed
- Test the drive on another PC or a mobile device