> If you zero out a hard drive with Disk Utility to map out the bad
> blocks, are they notated in a permanent fashion or will a simple
> reformat lose the bad block "map."

In a modern drive, the defects map is created when the drive is
manufactured and it is stored in a ROM within the drive.

Therefore, all drives report that every sector is good.

I am unaware of a method for recreating the contents of that ROM.



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