Beginning with Leopard we've been able to do this while booted from our install discs, but I don't think I've ever seen a Terminal command posted, and I'm not certain that what Google turns up is what I'm asking about.

Actually, I'm not even 100% certain what the exercise accomplishes, in the first place.

Anybody?

Thanks.

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In Memory of Harv: Those who can make you believe absurdities can make you commit atrocities. ~Voltaire