If flash memory is being used in solid state drives, isn't it going to wear out?

If flash memory is being used in solid state drives, isn't it going to wear out?: "My wife and I recently purchased a pair of iPads as Christmas presents for our college age children. A fellow at the Apple store told me that the main memory in the iPad is a flash memory device. I remember you stating in at least a couple of your columns that flash memory can be unreliable. That it can and will fail over time and often without warning. "

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