This can help free up disk space on devices with small amounts of storage, but you'll need the USB drive to refresh or reset your PC in the future. (howtogeek.com)
The one drawback is a lousily small amount of storage space for the driver. (edmunds.com)
As part of Windows 8.1 Update, Microsoft rolled out a new feature that allows Windows to fit on drives with a very small amount of storage space. (howtogeek.com)