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# 3.7.3 Configuring the Library

The USB MSD Host Client Driver requires configuration constants to be specified in `system_config.h` file. These constants define the build time configuration (functionality and static resources) of the USB MSD Host Client Driver.

## Macros

Name | Description
USB_HOST_MSD_INSTANCES_NUMBER | Defines the maximum number of MSD devices to be supported by this host application.
USB_HOST_MSD_LUNS_NUMBER | Defines the maximum number of MSD Device LUNs to be supported in the application.