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Think of it in other terms.... for example.....My friend recently bought a vintage motorbike. It was great, but made a rattling sound in top gear. He took it to a mechanic, who checked various common faults. All fine. He stripped the gearbox, to find one of the cogs was disintegrating. Had he kept using it, it would have got caught up in the other cogs, killed them, and killed the entire gearbox!A SMART test is an early warning system telling you that your drive WILL fail.If your hard drive is clicking, it WILL fail.In both cases, you may be able to read the drive. For now. Copy it, then stop using it.There are lesser faults, various corruptions, misalignment, even just a few bad sectors that are repairable and the drive will be fine. SMART errors and clicking though - treat them as an early warning detection and deal with it immediately!