Hardware Considerations for Biometric Drivers

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A biometric device that uses the WBDI framework should meet the following requirements:

  • WBDI-based drivers should follow DEVFUND-0010 guidelines for Terminal Services redirection.

    This requirement states that the device and its driver must support redirection through a Terminal Services session over the PnP Device Redirection Framework.

  • Biometric devices should have an internal buffer that is large enough to cache a full scan in full power and suspend modes.

    Larger buffer size can mean less dependency on timing during regular scan processing as well as scan processing during system resume.

  • The device should be able to enter a capture mode and make internal state transitions during a scan without extra commands from the host.