Diskdrive upper filter and boot

NTDEV
1

I restarted the VM!
I hadn’t done it all this time! And I saw the INACCESSIBLE_BOOT_DEVICE stop code.
It was set to demand start but it was needed in the boot. I set boot start for startType in inf. The driverloads but another stop code that is not relevant to this question.
The question is.
Is it neccessary for a diskdrive upper filter to load at boot?
Or I may set it to not be needed and not be loaded at boot? And how?

2

Is it neccessary for a diskdrive upper filter to load at boot?

Yes.

Think about how the device tree gets built. As devices are discovered, the drivers for those devices are loaded. Then then drivers may enumerate other (virtual or physical) devices. If there are filters for those devices, then those filters need to be loaded when the device is enumerated and the driver is loaded. You can’t go back later and stick a filter in between, say, the storage adapter and the disk drive.

Peter

3

Thanks for answering