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It all depends on the nature of the impending failure. Ignoring bad sectors cannot prevent a critical read error. For example, if the drive arm is failing you’ll encounter a problem that cannot be worked around. If your drive is almost to the “it just makes continual clicking noises” stage I would recommend against imaging your drive as a recovery option. At that point, a bare metal recovery might be more successfull or just copying your critical data to a secondary location. Do you know what is failing on your drive?