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I saw this post which said that the internal disk of a Mac should not be erased, but it doesn't explain why. Does anyone know?

  • Not sure where you saw "not to erase your Mac's HD" in that post. But at its basic level a Mac is just a computer and any drive can be erased. The difficulty comes in knowing how to recover from an erased disk, not especially difficult if you have some experience but a daunting task if you have no help or experience. – Steve Chambers Jun 7 at 0:12
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Yes, you can always erase a disk internal or external to set it up clean. The only reason to not erase is if you want to try and recover or back up any data.

I might try to repair a disk from recovery mode once or twice, then I erase to get a clean install.

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