All installations I have ever done of Solaris 10, OpenSolaris, SXDE and SXCE
the bootloader was always installed on the drive the OS was installed on.
Just to see that the OS works you can boot from the 2nd hd by BIOS (changing
boot order for example).
Otherwise there are programs (like Supergrub) that will install GRUB on the
master boot record of your first hard drive. This will allow you to boot
Windows on your first hard drive or to chainload (simply jump from the first to
the second hard drive) the second drive -> booting OpenSolaris.
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