While I'm not familiar with the particulars of how Disk Utility does it,
most drives have a reserve of extra blocks that can be substituted if a
bad spot develops. So by writing something to every block ahead of time,
any bad blocks will get noticed and replaced with a spare. I would think
that would already have happened at the factory or on the fly by the
controller on the drive, but it can't hurt. On a large drive it could
take quite a wile to zero out the empty space.
CB
On 12/30/13 6:51 PM, trahern culver wrote:
so what does it mean if a block is skipped? does it mean that things are not
copied between hard rives?
kind regards trey.
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