## 1.0 Introduction
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**cdrom.sys** is a system file used by Windows for booting from CD or DVD media. It’s not an executable file, but rather a configuration file that can be edited. The file is located in the root directory of your Windows installation (for example: C:\Windows\System32).
## 1.1 What is cdrom.sys?
**cdrom.sys** is a system file used by Windows to boot from CD or DVD media. It’s not an executable file, but rather a configuration file that can be edited. The file is located in the root directory of your Windows installation (for example: C:\Windows\System32).
## 1.2 What does cdrom.sys do?
**cdrom.sys** allows the system to boot from CD or DVD media instead of hard disk drives, such as floppy disks and hard drives. It’s used by Windows when you try to boot from a CD or DVD that doesn’t have an operating system on it (for example: a Windows installation disc). The file is responsible for allowing the computer to read the CD/DVD drive as if it were a hard disk.
## 1.3 How do I use cdrom.sys?
**cdrom.sys** is used by Windows when you try to boot from a CD or DVD that doesn’t have an operating system on it (for example: a Windows installation disc). The file is responsible for allowing the computer to read the CD/DVD drive as if it were a hard disk.
## 1.4 What happens if I delete cdrom.sys?
**If you delete cdrom.sys**, your computer will not be able to boot from any CD or DVD that doesn’t have an operating system on it (for example: a Windows installation disc). The file is responsible for allowing the computer to read the CD/DVD drive as if it were a hard disk.
Last Updated: December 11, 2025
Tested on: Windows 10 (22H2) & Windows 11 (23H2)