MSP430F5529: Mounting SD card as Mass Storage Device

Hello guys,

I am trying to mount SD card as Mass Storage Device via USB. I have successfully executed Example #M1_FileSystemEmulation which uses the MSP430 internal flash memory as the storage media. What I want is instead of MSP430's internal flash, I want to use the SD card as storage media. I have already developed SPI driver which communicates with the SD card via UCA1 using FatFS. This is my first exposure to the USB dev. So I want to know what needs to change in order to mouth SD card as the USB drive. Thanks in advance :-)