> I would expect the real issue is that we have a layout > mbr > disklabel > bootxx start > ... > bootxx end > [maybe some unused] > beginning of UFS > and I dimly remember 16 sectors, I'm fairly sure that, yes, the distance from "beginning of drive" to "beginning of UFS" is 8K for UFS1, assuming of course that there is a filesystem partition starting at start-of-disk. With one sector occupied by MBR and label, that left 7.5K for the bootblocks. And, indeed, 5.2's sys/ufs/ffs/fs.h has a comment saying, in part, * Depending on the architecture and the media, the superblock may * reside in any one of four places. For tiny media where every block * counts, it is placed at the very front of the partition. Historically, * UFS1 placed it 8K from the front to leave room for the disk label and * a small bootstrap. For UFS2 it got moved to 64K from the front to leave * room for the disk label and a bigger bootstrap, and for really piggy * systems we check at 256K from the front if the first three fail. /~\ The ASCII Mouse \ / Ribbon Campaign X Against HTML mouse%rodents-montreal.org@localhost / \ Email! 7D C8 61 52 5D E7 2D 39 4E F1 31 3E E8 B3 27 4B