I am in the process of selling my old Mini, so after migrated all my data to my new one, I wiped the drive (wrote zeros). I initially tried installing from the Snow Leopard disk, but the install failed for some reason. So, I pulled out my Leopard disk and attempted an install just to see if it was the disk or something like that. That also failed, so I ran disk utilities on the hard drive. After running repair disk, I got the error: "Invalid B-tree node size. Volume check failed. Error: Filesystem verify or repair failed." Any ideas? The hard drive was working fine before I wiped it.