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# 2.8.3 Configuring the Library

The following configuration parameters must be defined while using the MSD Function Driver. The configuration macros that implement these parameters must be located in the `system_config.h` file in the application project and a compiler include path (to point to the folder that contains this file) should be specified.

## Macros

Name | Description
USB_DEVICE_MSD_INSTANCES_NUMBER | Number of MSD function Driver instances required in the USB Device.
USB_DEVICE_MSD_LUNS_NUMBER | Defines the number of LUNs per MSD function driver instance.
Configuration on MCC | This section describes the symbols available in the MCC that can be configured.