Windows 10: Starting with Windows 10 2004 the PFA memory list is no longer recognized

Same question as here:Starting with Windows 10 2004 the PFA memory list is no longer - Microsoft CommunityWhy was an unresolved bug report closed without comment from MS..?Only reason I can think of is a large sum of money was accepted from the DRAM manufacturers' Assoc..??

:)

 

Starting with Windows 10 2004 the PFA memory list is no longer recognized

Starting with Windows 10-2004 the PFA memory list, as described for example here How to Manage the PFA Memory List - Windows drivers , is no longer recognized.

How to test:
1) Start „regedit.exe“, and export „ Computer\HKEY_LOCAL_MACHINE\HARDWARE\RESOURCEMAP\System Resources” as _text_ to a file A.
2) Choose a memory address to test the functionality. For example 32MB (=0x2000000 page number = 0x2000000 / 0x1000 {page size} = 0x2000).
3) Now open file A and ensure the chosen address (0x2000000) is part of a descriptor below “Physical Memory”, but neither part of “Loader Reserved” nor “Reserved”. Typically 0x2000000 should be fine.
4) Open an administrator command prompt and execute these commands to add the memory at 0x2000000 to the bad memory list by adding its page number 0x2000:
“bcdedit /set {badmemory} badmemorylist 0x2000”
To ensure Windows does not ignore the list this setting is also required:
“bcdedit /set {badmemory} badmemoryaccess no”
To be sure there is no override in the current settings also call:
“bcdedit /set {current} badmemorylist 0x2000”
“bcdedit /set {current} badmemoryaccess no”
The settings can be verified calling:
“bcdedit /enum {badmemory}”
“bcdedit /enum {current}”
5) Reboot the PC
6) Again start „regedit.exe“, and export „ Computer\HKEY_LOCAL_MACHINE\HARDWARE\RESOURCEMAP\System Resources” as text to another file B.
7) Compare file A and B.

Before Windows 10-2004 files A and B were different, because in file B the faulty page was excluded from usable memory, as you can see in the attached files.

Using Windows 10-2004 the only differences are the timestamps.

We also succeeded in reserving a memory range containing such a bad memory entry by calling “MmAllocateContiguousMemorySpecifyCache” (MmAllocateContiguousMemorySpecifyCache function (wdm.h) - Windows drivers).

 

{badmemory} Windows 10 2004 ignoring RAM adresses on badmemorylist

It well could be the PFA memory list is no longer recognized in 2004 as this thread states. I can not find any official word from Microsoft.

https://answers.microsoft.com/en-us/windows/for...

Or it could be your memory issue can not be resolved with blacklisting.

Check in the Windows 10 Feedback Hub and the memtest86 forums.

Here to help,

Rob

 

No longer recognizes CD/DVD drive


Since receiving the Win 10 Home upgrade my computer no longer recognizes the DVD drive. It doesn't show in Device Manger or in the device list in This PC although it does spin up if you insert media into it. I've tried all the suggested remedies except messing with the registry and nothing works. This is one of several problems I've had with device drivers since the upgrade.

Windows 10 Home 64 bit
AMD FX-4130 3.80Ghz
8Gb Installed memory