All USB flash drives will eventually go bad because their internal memory chips can only be used a finite number of times. However, the maximum number of read and write instances will likely never be reached on any device in normal use. Since every other component on USB flash drives can be prone to failure, another vital part of the device is likely to fail long before the memory fails from overuse.
Eject and Mount Failure are the most common issue to encounter. There's a reason why your computer advises you to properly eject or unmount a USB flash drive before removal: not doing so can break the device. The drive is constantly communicating with the computer while it is connected, and the eject or unmount commands disable this activity on the flash drive to prevent it from breaking on disconnect. If you don't properly remove the device, there's a chance that the memory will be corrupted or an electrical problem will fry a vital component.
NAND Memory Failure - Even if a USB Flash drive is not destroyed through environmental factors or internal component failure, the device will still eventually go bad if it is written to and read from enough times. However, USB Flash Drives are typically good for over the one hundred thousand-rated read and write life expectancy.
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