Hi,
For the USB mass storage device example you can take a look to the Keil MDK software package for the MCB1700 Board which includes an example of this.

Also, I recommend you to check AN11070 that describes how to use the SPI/SSP interface on the LPC1700 family MCU to access Secure Digital Card (SDC) or Multi Media Card (MMC).
Hope it helps!
Best regards,
Felipe
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