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RTX USB MSC with MMC interface of FlashFS

This is a general question:

Has anybody successfully implemented the RTX USB MSC together with the MMC interface of FlashFS on an LPC2148 having a microSD card connected to SPI1 ?

I used \Keil\ARM\Boards\Keil\MCB2300\RL\USB_FlashFS\SD_File as a starting point.

SPI data rates are 400 kBit/s and 15 MBit/s (LPC2148 operated @60 MHz).

MicroSD card access via FlashFS itself works fine. Also USB MSC enumerates correctly (windows recognizes the device and shows it as drive).

But accessing the drive in Windows leads to erroneous behavior varying from XP to 7.

Are there general performance issues with the above architecture?

I would realy appreciate some hints from the USB / RTX Guru ...

Thank you very much in advance.

Oliver