On Mar 23, 4:10 pm, Dan <[email protected]> wrote:

> At 3:04 PM -0400 3/23/2009, insightinmind wrote:
>
> >The answer then seemed to be yes ... zeroing a partition would cause
> >the controller to map out any bad sectors.
>
> Not seems - is.  Yes.  The controller ALWAYS maps out bad blocks
> whenever they're found, during any type of read or write operation.

If I may summarize the discussion about bad sectors.

Bad sectors (blocks) get mapped out on the fly during normal read/
write operations.

Bad sectors (blocks) get mapped out within a volume/partition when you
zero the volume/partition in Disk Utility or some other tool.

Bad sectors (blocks) get mapped out on the hard drive when you zero
the entire hard drive in Disk Utility or some other tool.

Secure Erase (also Secure Empty Trash) zeros whatever sectors had been
previously written to and therefore maps out any bad sectors
previously written to, and only those.

Zeroing does not equal mapping out.

Check?

Al Poulin

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