xcopy: "File creation error - the parameter is incorrect"

Are you getting the error "File creation error - The parameter is incorrect" when using xcopy and can't work out why?

You are probably (like me) using a USB disk or other drive which is formatted using FAT32 filesystem. If so, any file over 4GB in size will most likely throw up this issue.

To resolve, re-format the drive as NTFS and the copy will then work.