Ultracopier is absolutely free and fully open source copying tool for Windows. Its an ultimate copying tool containing options like play or pause the copying process, can control speed limitation, can resume at on-error, error or collision control management and is much better then default copying feature of Windows.
This copying tool is very stable and recommended for users who wants basic features like pause, resume, buffer control etc which you can’t do that in Windows.
Get it free from here: Ultracopier Tool
