This is not related to the linux-kernel. Thanks to people on the debian-isp list I found out the problem has to do with partitioning and 4K sector size. See this thread for more details http://lists.debian.org/debian-isp/2011/08/msg00011.html Michael -- Michael Moritz GreenNet Systems Administrator michael@gn.apc.org | http://www.gn.apc.org T: +44 (0)20 7065 0941 F: +44 (0)20 7065 0936