Why not bury it with a netbook or cheap laptop if you absolutely must bury electronics period? The 110V plug we use today will still be in use in the future. Make sure the battery has about a 15% charge, and all the "latest" updates...you'll be 100% golden and working when it's opened; just charge up the battery and voila, working system. I don't think HDD's wil degrade after 15 years of being unpowered will they?
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Why not bury it with a netbook or cheap laptop if you absolutely must bury electronics period? The 110V plug we use today will still be in use in the future. Make sure the battery has about a 15% charge, and all the "latest" updates...you'll be 100% golden and working when it's opened; just charge up the battery and voila, working system. I don't think HDD's wil degrade after 15 years of being unpowered will they?