Story: Last weekend when I tested on my Laptop it corrupted the filesystem after 2nd reboot. A few revisions later it destroyed my partition list (no worry, restored them).
After this experience I've decided to allign my partitions to the advanced format with a starting sector of 2048: Installer says it cannot install the bootcode to the harddisk and asks for floppy! I always used the "install vbr only" option succesfully before (starting sector had been 63 before). I've also installed reactos countless times to the 3rd partition a year or so ago.