The computer doesn't have a hard disk, so you can use a USB flash drive as a hard disk. But the general U disk is too small to be used as a system disk, but it is not enough to store things or install programs.
U disk, full name of USB flash drive, English name of USB flash drive. It is a miniature high-capacity mobile storage product, which uses USB interface and does not need physical drive. Connect with computer through USB interface to realize plug and play. The name of USB flash drive comes from a new storage device produced by Netac Technology, which is called "USB flash drive" and is connected by USB interface.
After the USB flash drive is connected to the USB interface of the computer, the data of the USB flash drive can be exchanged with the computer. However, the equipment with similar technology produced later, because Netac has registered the patent, can no longer be called "USB flash drive", but changed its name to "USB flash drive". Later, the name U disk was widely known because it was simple and easy to remember, and it was one of the mobile storage devices.