Lion and external disk freeze/erase

Using a 2008 MacPro 32 GB RAM LION 10,7,2

I have had a LOT of screen freezing issue with lion and external drive acces.

The worse was lion ERASING the fat of all external 1Tb Fat32 formated e-Sata drives, then freeze and grey screen with critical error.

No more access to the disk after need to reformat them !!! Using a Tempo E4S pci-e card

It was the that with EVERY Fat32 e-sata 1Tb drives I tryed ... Frightening ! hopefully it was some extra backup disks !!!

plus at least one freez a day when I do access external HFS+ e-sata drive USB3 drives...

ennoying

really ennoying