double booting with iMac (bondie blue, rev 1)

[SFM]

I don’t quite get how can I have an operating system running smoothly (Mac OS 
8.6) in a disk that has an obviously corrupt partition table ? More important, 
most probably disk utility messed up my partition table, so why should I trust 
it now to do the job well ? Could wiping the drive out using the same utility 
really be the solution ?