> As for long-term data retention and data loss over time, flash memory operates by storing and sensing electron charges in an array of floating-gate MOSFETs. This electron charge can be changed by essentially forcing electrical charges through the insulator that forms the floating gate in each transistor to store data.
Over time, electrons can leak out of the floating gate insulators, resulting in data loss or corruption. This process may take many years for flash memory that has not seen much use, but an SSD that has seen heavy use will have worn down the floating gate insulation inside …