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Stuck in a boot loop after failed update to Mavericks, can't reformat HDD

I recently tried to upgrade a 2008 Mac Pro from Snow Leopard (10.6.8) to Mavericks (10.9.2) using the free upgrade available in the App Store. The upgrade seemed to go without a hitch until the ...
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4answers
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How to install Mountain Lion on a disk that cannot be formatted in recovery mode?

I'm trying to do a clean install of Mountain Lion but I'm not being able to format my partition. I previously had Lion, encrypted the disk, then upgraded to Mountain Lion, then booted into recovery ...
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1answer
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Repair disk on Snow Leopard using a bootable USB, in order to upgrade to Lion

[Mid-2010 MacBook Pro running the latest version of Snow Leopard] I read in many places that you should always do a "Verify Disk" in Disk Utility and resolve any errors before upgrading to Lion. I ...