re: My E: and D: Drive Have Disappered
Thursday, March 1, 2007 at 5:34 pm
Windows XP Annoyances Discussion Forum
Posted by Rich Kurtz
(12246 messages posted)
Sorry! Included everything but the actual info. Here it is:
If your CD/DVD Drives won't appear in your list of drives, you can probably correct
this as follows:
Open regedit. Navigate to
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Class\{4D36E965-E325-11CE-BFC1-08002BE10318}
Export the key for backup. Delete any value named "UpperFilters" or "LowerFilters"
(Only exact match!). Repeat for every ControlSet?. Reboot.
Explanation: Drivers for devices are modularized. It wouldn't make sense for them
not to be, as, for example, filesystem drivers would have to know how to talk to
every possible type of hard drive. Part of this modularization is called the device
stack. The IO Manager interfaces with the top driver on the stack, and the bottom
driver on the stack interfaces with the physical hardware.
The keys under the Class key each specify a hardware type. When hardware of that
type is installed, the device-specific driver for the given device type is loaded
and used. To modify that drivers behavior, a second driver--called a filter driver--can
specify that it wishes to be above or below the device-specific driver. The UpperFilters
and LowerFilters keys specify the name(s) of the filter driver(s). Some programs
that install filter drivers are: Packet-writing support, such as InCD; iTunes.
If one of the drivers referenced in these keys cannot be found (under HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services),
loading the driver for the device fails.
Alternatively, you can try this fix from the Doug Knox site:
http://www.dougknox.com/xp/scripts_desc/xp_cd_dvd_fix.htm
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 |  | re: My E: and D: Drive Have Disappered (Rich Kurtz: Thu, Mar 1, 2007, 5:34 pm) |
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