during dd tests i encounter hardware problems with my harddisk. is there
a way to mark parts of the hdd as "bad" so those are not used anymore?
not much.

you may label it the way it will skip that part.

anyway - sata/IDE drives has in-hardware bad block remapping. if you see bad blocks there is already out of space for remapping.

OR - just something was recorded badly some time ago.

clear whole drive with zeros and then retest. there is high change problem will go out.

if not - don't use that drive for anything valuable at all
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