SunOS 4.x boot disk layout

Does anyone happen to know the organisation of a SunOS 4.x hard drive? Looking at the disklabel under Linux, I get the following: | Disk /dev/sdb (Sun disk label): 15 heads, 131 sectors, 1701 | cylinders Units = cylinders of 1965 * 512 bytes | | Device Flag Start End Blocks Id System | /dev/sdb1 0 48 47160 0 Empty | /dev/sdb2 48 152 102180 0 Empty | /dev/sdb3 0 1701 1671232+ 0 Empty | /dev/sdb4 152 264 110040 0 Empty | /dev/sdb7 264 1701 1411852+ 0 Empty (ignoring the 'empty' - think that must be a bug in Linux fdisk as I know there's a valid OS on the disk) Googling shows the first entry to be the root partition on such a drive, second entry to be swap, third to be the whole disk entry, and the rest to presumably be aux partitions... However, obviously some space is taken up by the partition table itself, so the first (root) partition can't start at block zero. What I'm trying to find out is the offset that it does actually start at, so that I can mount the root partition from Linux. Hopefully someone knows, if not it's trial and error time... :-) ta Jules