hello... i think i found out what happened (at least with my vertex 2)
the disk alway "freezes" when i disconnect it from my notebook-sata-port (hp 625 notebook). from the moment i re-connect it changes are non-persistable.
then i have to install the newest firmware and the disc is writable again (until i pull it out again).
anyway - the last attempt installing the latest firmware made it disappear in bios - it seems as if the drive is dead now.
i wrote these findings to a guy who seems to be from ocz but didn't get an answer till now.
please report if your vertex 2 acts the same way as mine does.
greets - woif