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In what top scientists are calling "pretty gay", Solaris can't handle disks that used to have non-solaris stuff on them without being wiped first.
I thought only the windows installer borked if the partition table looked weird, but no! The installer could not see the disk, and I was dropped into a dtterm where I had to do "dd if=/dev/zero of=/dev/dsk/c0t0d0 bs=1048576" and reboot.
So... wipe the disk before trying to install Solaris.