CD-ROM Driver (cdrom) Service Defaults in Windows 7

SCSI CD-ROM Driver by Microsoft Corporation.

Default Settings

Startup type:System
Display name:CD-ROM Driver
Service name:cdrom
Service type:kernel
Error control:normal
Group:SCSI CDROM Class
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\cdrom

Default Behavior

CD-ROM Driver is a kernel device driver. In Windows 7 it is being loaded at Kernel initialization. If CD-ROM Driver fails to start, Windows 7 attempts to write the failure details into Event Log. Then Windows 7 startup should proceed and the user should be notified that the cdrom service is not running because of the error.


If CD-ROM Driver is stopped, the CD/DVD File System Reader service fails to start and initialize.

Restore Default Startup Configuration for CD-ROM Driver

1. Select your Windows 7 edition and service pack, and then click Download.

2. Save the Win7_cdrom_Service_Startup.cmd file to a local storage device.

3. Run the saved file as an administrator.

4. Restart the computer.

The cdrom service is using the cdrom.sys file that is located in the %WinDir%\system32\DRIVERS folder. If the file is changed, damaged or deleted, you can restore its original version from Windows 7 installation media.