Computers without a pre-installed OS

No OS

— no pre-installed operating system included with the PC. Such models are often carried on board FreeDOS — free analogue of MS-DOS; however, in fact, this system is suitable only for general health check and cannot be considered full-featured OS. Anyway, the absence of an operating system will come in handy for those who want to choose the software base for their PC themselves: you can install any option compatible with the hardware platform on “clean” computer. Yes, and such configurations are usually cheaper — after all, many modern operating systems are paid, and their price is included in the cost of the computer.