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JSI Tip 1091. ATAPI CD_ROM is not accessible when added after installation?.

If you added an ATAPI compliiant IDE CD_ROM after performing a WINNT /B installation, the CD-ROM may not be accessible.

The system recognizes your CD-ROM, in Explorer and in Disk Administrator, but users receive:

   <Drive:>\ is not accessible.

   The volume does not contain a recognized file system. Please make sure that
   all required file system drivers are loaded and that the volume is not

 or from a Windows command prompt: 

   The System cannot find the drive specified.
This is caused by the CD-ROM file system ( CDFS) registry entries not having been setup properly.

To resolve the problem, use Regedt32 to navigate to:


With the 0000 key selected, click Save Key on the Registry menu and call it JSI.REG.

Browse to:


Select the 0000 key and click the Security menu and Permissions. Grant Everyone Full Control and click OK.

With the 0000 key still highlighted, use Registry / Restore and select the JSI.REG file.

With the 0000 key still selected, double-click DeviceDesc in the right hand pane and change the string data to Cdfs Device.

Double click Service in the right hand pane and change its' string to Cdfs.

Shutdown and restart your computer.

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