It’s how flash storage works. Bad blocks get marked and then the storage controller ignores those blocks when storing data. If you looked at the size of the drive before and after, you would notice the size has decreased. The first part of the drive is the most used and flash memory bits die after a lot of write cycles. Usually in the hundreds of thousands to millions of cycles, but not always. Depends on the quality of the flash memory, temperature, how they’re treated, solar flares, witchcraft, etc.
It’s how flash storage works. Bad blocks get marked and then the storage controller ignores those blocks when storing data. If you looked at the size of the drive before and after, you would notice the size has decreased. The first part of the drive is the most used and flash memory bits die after a lot of write cycles. Usually in the hundreds of thousands to millions of cycles, but not always. Depends on the quality of the flash memory, temperature, how they’re treated, solar flares, witchcraft, etc.