On 10/4/11 6:08 AM, [email protected] wrote:
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.
Low-level format. This will re-write the bad block map on a hard drive.
It is not what Disk Utility does when it zeroes the data, it only
rewrites those reported to the OS as "good". No need to zero the bad
blocks, if data is going there, it's lost!
When a drive has enough bad blocks to require a low-level format, it's
usually on the way out anyways. If you monitor SMART on a modern drive,
you can see the errors.
Stephen
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