What is cdrom?

Cdrom.sys is a Windows driver. A driver is a small software program that allows your computer to communicate with hardware or connected devices. This means that a driver has direct access to the internals of the operating system, hardware etc. The free file information forum can help you determine if cdrom.sys is a Windows system file or if it belongs to an application that you can trust.

Run a free scan to check for cdrom drivers in need of updating

Cdrom.sys file information

The process known as SCSI CD-ROM Driver or CD-ROM Driver belongs to software Microsoft Windows Operating System by Microsoft (

Description: Cdrom.sys is an important part of Windows, but often causes problems. The file cdrom.sys is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 62,976 bytes (50% of all occurrences), 67,072 bytes, 49,536 bytes, 108,544 bytes or 84,800 bytes. 
The driver can be started or stopped from Services in the Control Panel or by other programs. The program is not visible. The service has no detailed description. The file is a Microsoft signed file. cdrom.sys appears to be a compressed file. Therefore the technical security rating is 8% dangerous, however you should also read the user reviews.

Recommended: Identify cdrom.sys related errors

Important: Some malware disguises itself as cdrom.sys, particularly when not located in the C:\Windows\System32\drivers folder. Therefore, you should check the cdrom.sys process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


User Comments

lightscribe dvd supermulti drive cd writer
  phillip wheatley  
Liable for virus problems
File Version 5.1.2600.5512 is File Size 62,976 bytes
  Dave / B00kwyrm  
My cdrom.sys was a virus. Was lucky to cure it.
  Lisa   (further information)

Summary: Average user rating of cdrom.sys: based on 5 votes with 4 user comments. 3 users think cdrom.sys is essential for Windows or an installed application. One user suspects danger. One user thinks cdrom.sys is dangerous and recommends removing it. One user is not sure about it.

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Best practices for resolving cdrom issues

A clean and tidy computer is the key requirement for avoiding problems with cdrom. This means running a scan for malware, cleaning your hard drive using cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the cdrom.sys process on your computer, the following programs have proven to be helpful: Security Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. Malwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

cdrom.sys [all]