Developer Forum

Hi,

I have a WDM filter driver (say busguard.sys). I installed this driver
as upper filter driver to the following classes

1. PCMCIA Adapters
2. IDE ATA/ATAPI controllers

Is there any problem in installing same driver as filter to more than
one classes. How many times my driver will be loaded to memory.


John

your driver image will be loaded once. your AddDevice routine will be
loaded for every instance of a device in each of the classes. there is
usually no problem doing this, but if there are different rules for each
class, you must account for them in the driver in the same code base.

d

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