Content originally posted in LPCWare by CodeRedSupport on Mon Apr 02 01:57:38 MST 2012
Sorry, but your description makes no sense.
The RDB1768v2 board provides drag2flash functionality through the debug connection (the USB connector on the short edge of the board). This provides a mass storage interface to the PC to allow you to drag a binary file onto the board - which is copied into the flash of the main LPC1768 MCU when you press SW4 on the board. After the copy completes, the main MCU will be reset, so that this application starts running.
The drag2flash has absolutely no connection to the SD card interface of the board, which is connected only to the main LPC1768 MCU.
The only thing that I can think of here is that you have some software installed into the flash of the main LPC1768 MCU which is providing a USB mass storage interface through the USB device connector (along the long edge of the board).
But I am afraid that from the description that you have given so far, there is not really any further advice that we can provide at this stage.
Regards,
CodeRedSupport