I just installed the archlinux-hf-2013-02-11 image.
After updating the kernel every thing is gone on th sd card. GParted says that no partions were found.
It s the same effect on updatin linux-raspberrypi or on replacing it by linux-raspberrypi-latest.
If I unzip linux-raspberrypi-latest.tar.xz package by hand the kernel update is successfull but the entetiy in the pacman datebase is wrong.
hhmm ... perhaps it is not the installation of linux-raspberrypi(-latest) but the unistall routin of the old package?
Tom.