But I feel also that Seagate-drives more often fails by coldboot (not showing up), then Hitachi, and needs a reset before showing up. This might also change when connected together with other different devices. I have no good solution on it, just that it might vary depending on configuration. So it might change if changing some else device you also have connected.
It sounds like the Peg2 is probing the IDE channels before the Seagate drive starts up . Most current PC BIOS'es allow the user to configure a boot delay in seconds for this specific reason.