I have searched the net and found nothing to the point. Under both RedHat 8 and 9, I have successfully used two usb1 PenDrives, as well as a usb2 SanDisk cruzer mini drive. Under Fedora Core, however, the mere plugin and unplugin of the SanDisk without anything else totally freezes Fedora. Only option is to hard reboot the machine. This happens every time with the SanDisk, and also with the PenDrives after several uses. It happens in my two HP machines, a notebook Pavilion xf28 (Atlon XP 1.8) and my desktop Pavilion a265c (P-4). The only information I have found showing something similar concerns the sync of a pilot using also a usb connection, so I suppose the problem is usb related (hotplug?). Any hint on this matter will be greatly appreciated.