You really don't need anything special to upgrade your empeg, except for a new HD, a screwdriver, a hex tool and the FAQ which you've already been linked to. Everything else you need was shipped with your Empeg when you bought it.

Just follow the FAQ, it's really easy and pretty bulletproof.
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Riocar 80gig S/N : 010101580 red
Riocar 80gig (010102106) - backup