@Ted : i'm not really complaining, i'm just not seeing the real advantage of a hxc over a floppy. If the sd cards are that fragile, having all your sounds on a single one could be a real problem when the sd card is crashing. As stated by RVK : frequent backup strongly advised..
@Robert : yes i re-formated the "read fat..." card, on the pc, with no chance. Same behaviour before and after...
Maybe it's because i'm a hxc newbie, i'll dig it...