Flash memory NOR chip retention data

[tiago1986]

in the datasheet of my flash memory NOR ST M29W640FT 70N6 H has a data retention of 20 years, is it possible to increase this retention time to unlimited? the chip is installed in a snes cartridge

[Jeroen3]

Didn't you already get your answers here?
https://www.eevblog.com/forum/microcontrollers/questions-nor-flash-memory/

[ataradov]

Here we go again. No, physical things degrade with time. It is impossible to make things last forever. Literally nothing in the Universe lasts forever.

20 years is just an industry standard "forever, but don't sue us if something fails". In reality under room temperature conditions it will last as long as your physical package lasts. No manufacturer would want to investigate failures on a 20 year old device.

Also, if you are worried about the contents, just refresh it every 10 years. 20 years retention is from the last erase and write time.

Also, PCBs themselves degrade with time and also have limited time.

But we have already discussed that.