CD/DVD File System Reader (cdfs) Service Defaults in Windows 7

ISO9660/Joliet File System Reader for CD/DVDs. (Core) (All pieces).

Default Settings

Startup type:Disabled
Display name:CD/DVD File System Reader
Service name:cdfs
Service type:filesys
Error control:normal
Group:Boot File System
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\cdfs

Default Behavior

CD/DVD File System Reader is a file system driver. In Windows 7 it is disabled and therefore it isn't starting. If CD/DVD File System Reader 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 cdfs service is not running because of the error.


CD/DVD File System Reader is unable to start, if the CD-ROM Driver service is stopped or disabled.

Restore Default Startup Configuration for CD/DVD File System Reader

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

2. Save the Win7_cdfs_Service_Startup.cmd file to a local storage device.

3. Run the saved file as an administrator.

4. Restart the computer.

The cdfs service is using the cdfs.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.