François, as far as I remember the 50g has full support for FAT16 and limited support for FAT 32 on the SD cards, also HP recommends that you use a USB/SD card reader to transfer between PC and 50g SD card.
I have not seen anywhere mentioned that the 50g appears to a PC as an MSD (mass storage device) since it needs drivers to work with windows XP.
From memory of what other people have said in the old forum if you accepted the default install of the USB subsystem for your PC when you installed eCS then as far as eCS is concerned your USB ports are setup to read anything that presents its self as a MSD. The only thing you might need to do, if you want a MSD to have a drive letter, is to use the LVM to give it one.
You should go to hobbes and get the usbcfgb075.zip and read the excellent INF files it contains, they should answer all the questions you may have. If they don't then just ask on this forum.
