Difference between Legacy Driver and a WDM Driver

NTDEV
1

What is the difference between Legacy Driver and a WDM Driver?
Anand

2

“Anand” wrote in message news:xxxxx@ntdev…
>
> What is the difference between Legacy Driver and a WDM Driver?
>

In a phrase: PnP support.

“Legacy Drivers” are NT V4 style, creating device objects in their
DriverEntry entry point.

“WDM drivers”, loosely speaking, create device objects in their AddDevice
entry point, and call IoAttachDeviceToDeviceStack to attach their device
objects to the underlying PDO stack.

Peter
OSR

3

Legacy driver scans for hardware itself, while WDM one relies on PnP
for this.

Max

----- Original Message -----
From: “Anand”
To: “NT Developers Interest List”
Sent: Wednesday, July 31, 2002 3:23 PM
Subject: [ntdev] Difference between Legacy Driver and a WDM Driver

> What is the difference between Legacy Driver and a WDM Driver?
> Anand
>
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