This article was previously published under Q173485
IMPORTANT: This article contains information about editing the registry.Before you edit the registry, make sure you understand how to restore itif a problem occurs. For information about how to do this, view the"Restoring the Registry" Help topic in Regedit.exe or the "Restoring aRegistry Key" Help topic in Regedt32.exe.
After you add a new hard disk, either the new hard disk or a preexistingdrive (such as a CD-ROM drive) may no longer be listed in My Computer.The drive remains accessible from a command prompt.
When you create a compressed hard disk volume, the compressed volumereceives the drive letter of the original drive (for example, drive C),and the original uncompressed (or host) drive is relocated to a higherdrive letter (for example, drive E).
When the compressed volume is created, Explorer.exe is instructed to notshow the host drive in My Computer (in this example, drive E.)
When you add a new hard disk, it receives a drive letter assignment (forexample, drive D), causing all subsequent drive letters to shift by one.For example, if a CD-ROM was drive D, it is relocated to drive E.
When Explorer.exe follows its instructions not to show drive E, itinadvertently hides the CD-ROM drive instead of the actual host drive(which has now moved to drive F).
WARNING: Using Registry Editor incorrectly can cause serious problemsthat may require you to reinstall Windows 95. Microsoft cannot guaranteethat problems resulting from the incorrect use of Registry Editor can besolved. Use Registry Editor at your own risk.
NOTE: For information about how to edit the registry, view the ChangingKeys And Values online Help topic in Registry Editor (Regedit.exe). Notethat you should make a backup copy of the registry files (System.dat andUser.dat) before you edit the registry.
To work around this issue delete the "NoDrives" value in the followingregistry key: