No matter what kind of storage technology is adopted, the stored data cannot be saved forever. There will be a period of time in flash memory:
Data retention is the problem of data storage time.
When the deadline is reached, the data will go wrong, indicating that ECC cannot successfully correct the data read by flash memory.
Data retention is related to the thickness of the oxide layer under the floating gate layer. After all, the thicker the oxide layer, the less likely the electrons are to leave. The research shows that if the thickness of oxide layer is 4.5nm, the theoretical data can be saved for 10 years.
