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Question: What are WDM drivers?

Answer:

WDM is an abbreviation for Windows Driver Model, which was developed by Microsoft to create a source-code driver technology for Windows 2000 and XP. WDM works by integrating some of the code right in the operating system to handle low level buffer management, as well as Direct Memory Access (DMA). This type of driver is more streamlined and works more efficiently than other drivers. You should use this type of driver if a company offers one, because it will typically yield better performance.

WDM drivers are alternative in many cases to ASIO drivers, which were developed as a third party standard. Microsoft has adopted WDM as a standard, low-latency driver architecture and it is being support by many companies such as Cakewalk.