This security setting determines whether a CD-ROM is accessible to both local and remote users simultaneously. If this policy is enabled, it allows only the interactively logged-on user to access removable CD-ROM media. If this policy is enabled and no one is logged on interactively, the CD-ROM can be accessed over the network. Default: This policy is not defined and CD-ROM access is not restricted to the locally logged-on user. Counter Measure: Enable the Restrict CD-ROM drive access to locally logged-on user only setting. Potential Impact: Users who connect to the server over the network will not be able to use any CD drives that are installed on the server whenever anyone is logged on to the local console of the server. System tools that require access to the CD drive will fail. For example, the Volume Shadow Copy service attempts to access all CD and floppy disk drives that are present on the computer when it initializes, and if the service cannot access one of these drives, it will fail. This condition will cause the Windows Backup tool to fail if volume shadow copies were specified for the backup job. Any non-Microsoft backup products that use volume shadow copies will also fail. This policy setting would not be suitable for a computer that serves as a CD jukebox for network users. Fix: (1) GPO: Computer Configuration\Windows Settings\Security Settings\Local Policies\Security Options\Devices: Restrict CD-ROM access to locally logged-on user only (2) REG: HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Winlogon!AllocateCDRoms