dd, ddrescue and bad blocks...
 

hi,
i have a couple of disks wich are ok, but with a few fixed (marked) bad blocks.

what happens if i use them as target disks of a cloning process (using dd or ddrescue)?

will dd or ddrescue be aware of the marked bad sectors?

thanks!

How are those sectors marked bad? With any modern disk (last decade, at least), any write to a bad sector would cause the drive to reallocate that space to a spare sector. Such a reallocation is transparent to the OS, which sees a fault-free disk. Only the drive's SMART attributes would reveal that anything had happened.

so, if i got it properly, once the bad sectors are marked with fsck there is no risk they can be "unmarked", right?

As soon as they are written to, they will no longer be "bad" as seen from the OS. The drive itself will take care of that.