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 of CD-ROM Driver

1. Run the Command Prompt as an administrator.

2. Copy the commands below, paste them into the command window and press ENTER:

sc config cdrom start= system
sc start cdrom

3. Close the command window and restart the computer.

The cdrom service is using the cdrom.sys file that is located in the C:\Windows\system32\DRIVERS directory. If the file is removed or corrupted, read this article to restore its original version from Windows 7 installation media.