What recommendation do I follow to avoid losing data retention in NOR flash memory M29W640FT?

[ÍStef.1]

doubt flash memory

[Tesla DeLorean]

Voltage and Temperature tend to play a role.

Are you looking for suggestions about checking integrity, using ECC or deep-cycle erasing?

What kind of data are you trying to store/protect?

[ÍStef.1]

I have two copies of a snes cartridge both use the NOR flash memory STM29W640FT and in that memory the firmware of the cartridge is recorded a copy is saved and I do not use it regularly but if the firmware is erased the cartridge does not work and I want to keep the file always saved in this NOR flash memory

will the files be silently deleted in the future?

[Tesla DeLorean]

The flash memory should retain content over many years, if you're losing data something else is likely wrong.

With these type of NOR memories the array could be deep-cycled via Erase, Write All Zeros, Erase, Write New Content

[ÍStef.1]

I am not losing data and they are recorded in the NOR flash memory M29W640FT 70N6 i doubt How many years does this memory retain data at a temperature of 34ºC?