USB disk problem

My USB drive (an Extreme 64Mb usb flash disk, recognised as "Oti flash disk" or similar both under Windows and Linux) has a problem since a couple of YOU ago. Everything worked fine until I upgraded the kernel (should be two kernel updates ago IIRC): now the drive is being mounted as /dev/sda1 on /media/usb-storage-7777777777777777:0:0:0p1 type subfs (rw,noexec,nosuid,nodev,sync,procuid,iocharset=utf8) instead of the usual vfat. Result: the system hangs in every operation I try to do (cp, mv, etc.) both from KDE and from the shell. I tried unmounting and then remounting the drive as vfat, and everything works correctly. I was wondering if there were some ways to fix/workaround this. Thanks in advance, S.