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Old 08-29-2016, 12:57
Kerlingen Kerlingen is offline
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Mark memory page as invalid

Does anybody know a way to mark a physical page of memory as invalid or bad somehow on Windows x64?

One of my RAM modules sometimes has a single-bit error at the same fixed address (found by memtest86+). The memory page is located in higher RAM, so it will be unused right after a reboot, but eventually Windows will use it for programs (unexpected crashes) or caching (corrupted files). I want to make sure Windows never tries to store anything on that memory page.

I can't get a single RAM replacement module, I would need to buy 6 new modules. I would like to prevent that if there was an easier fix.
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Old 08-29-2016, 14:11
nulli nulli is offline
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You can mark memory as bad.

But first I would move the defected RAM module far away from Memory Bank 0 (first slot that's going to be used) and then tell Windows _not_ to use that part of the RAM module using bcdedit commands:
bcdedit /set badmemorylist xxx xx
bcdedit /set badmemoryaccess No

For more information see:
https://msdn.microsoft.com/en-us/library/windows/hardware/ff728891(v=vs.85).aspx
http://superuser.com/questions/420051/running-windows-with-defective-ram
http://www.passmark.com/forum/memtest86/5146-memtest86-results-assistance-required-please

Last edited by nulli; 08-29-2016 at 14:18.
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Old 08-29-2016, 15:46
Kerlingen Kerlingen is offline
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I read the bcdedit documentation and hoped to find something there, but I only found truncating memory and burning memory settings. I hate it when something from Microsoft has useful features and they don't care about documenting them.

The corrupted RAM module is at bank 4. I could put it even further away, but I then I would need to run memtest again to find out the new location, so I'm sticking with this where I already know the bad memory address.

"bcdedit /set badmemorylist" will not work, the correct syntax would be "bcdedit /set {badmemory} badmemorylist".

So now I'm hoping to see no more corrupted files or random crashes in the future.
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Old 08-29-2016, 19:49
nulli nulli is offline
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Sorry, I haven't used that command before. I just did some quick googling.

Anyways, hopefully it works as expected.
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