Yes. They are real.
tv
Microsoft Disc Operating System
The disk drive doesn't. The operating system determines that there are no files on the disk.
All the OS are compatible with dual OS.but here i will suggest you keep it parallel.
A disc operating System (DOS) which was marketed as MSDOS (MicroSoft Disc Operating System). It enabled the open platform, IBM Personal Computer, to be operated by typing in simple commands.
A recovery disc is a CD or DVD used to restore the operating system of a computer to working or factory conditions.
a disk which is parallel
DOS meaning Disc Operating System
Use a boot disc or a Linux LiveCD such as Knoppix
Answer is in english: Ans: DOS is the abbreviation of "Disc Operating System"
Load the disc since hard drive won't have one to get to the internet to download, you have to use disc drive