serious 3ware 9500 problem on 5-stable and 6-stable

[bogo logo]

hi list,

i have a 3ware 9500-8 with 4x 400gb drives in a raid5 configuration running
FreeBSD 5.4-stable (as of last week) on amd64.  during a recent update, we
try to mount the 1.1TB partition, and we can see the first few directory
listings and so on, but when we try to `cd <direectory>` on a dir, the
computer just reboots.  is this a known problem?  and everytime i run fsck
on the raid5, it says that it cannot read superblock info and that some
negatve sectors could not be read..

THE FOLLOWING DISK SECTORS COULD NOT BE READ: -2003455344, -2003455343,
-2003455342, -2003455341, -2003455340, -2003455339, -2003455338,
-2003455337, -2003455336, -2003455335, -2003455334, -2003455333,
-2003455332, -2003455331, -2003455330, -2003455329,

..

anyone ran into thsi before? any hel pwoudl be appreciated.