Windows 11 Reg fix for SN770, SN580 (and other) HMB force to 64M

WD-HMB64M.reg

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\StorPort]
"HMBAllocationPolicy"=dword:00000002

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\stornvme\Parameters\Device]
"HostMemoryBufferBytes"=hex(7):56,00,45,00,4e,00,5f,00,31,00,35,00,42,00,37,00,\
  26,00,44,00,45,00,56,00,5f,00,35,00,30,00,31,00,37,00,26,00,52,00,45,00,56,\
  00,5f,00,3f,00,3f,00,20,00,36,00,37,00,31,00,30,00,38,00,38,00,36,00,34,00,\
  00,00,56,00,45,00,4e,00,5f,00,31,00,35,00,42,00,37,00,26,00,44,00,45,00,56,\
  00,5f,00,35,00,30,00,34,00,31,00,26,00,52,00,45,00,56,00,5f,00,3f,00,3f,00,\
  20,00,36,00,37,00,31,00,30,00,38,00,38,00,36,00,34,00,00,00,00,00

Thanks, value that worked for the sn550 if anyone else is interested is:
VEN_15B7&DEV_5009&REV_?? 67108864

SN530 too seems to be affected, the value to add to HostMemoryBufferBytes is VEN_15B7&DEV_5008&REV_?? 67108864

Possibly you will need to check your PCI device id in device manager.

You might to experiencing a different issue, as WD don't list your drive as affected ? Have you checked your current HMB allocation?

Have you checked your current HMB allocation?

This is what I see in HWinfo with the fix:

Without the fix I get IO1 Initialization failed BSOD

Interesting looks like WD have missed some affected models. You could try and let them know via a support ticket.

But I'm not 100% sure it's a problem, for example now successfully booted with HMB 200MB (which still seems abnormal to me) without BSOD: