Monsoon,
It does warn you. I canceled the FW upgrade and backed up all my music first, then I updated then copied it back. I upgraded mine last night to see what the commotion was all about. My SanDisk 128mb MicroSD is still being recoginzed by the PC and Express. With the card inserted, i dont seem to notice any slowdown. Menu navigation is normal.
What is the FW you guys got? I have 1.01.01A