Bought an Extreme model with 128 GB. The value of 119 gigabytes for the usable storage space is fairly acceptable. It might have been much worse. The speed is satisfactory. The full formatting and a stress test of the "surface" of broken areas did not uncover any broken areas, which is something that may be reasonably anticipated. Broken parts are automatically concealed in recent maps, and the only indication that this has occurred is a reduction in the volume that is now shown. The volume is good, but there is additional material. Let's check back in after a couple of months to see what the results are.
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