> After the write operation completes however only the first 512 bytes have > been written. Is /dev/disk/ata/0/master/raw limited to the MBR sector only? A quick test with dd and DiskProbe showed that the data is written to the second sector however only for a short amount of time, after restarting DiskProbe the old contents was there again. So either there is a bug writing to the disk or there is another thread that permanently writes the Haiku boot loader to the disk. - Michael