To put it shortly, formatting your hard disk will NOT reduce its lifespan. Yes, formatting is popularly thought to reduce hard disk lifespan but that is nothing more than a myth.
Formatting is NOT a stressful event for the hard disk. The read/write heads do NOT touch the platter surface, so damage to the platter only occurs if there is any shock to the drive during operation. You can format your hard disk 20 times a day, every day and it will not be more likely to fail than any other drive.
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