Doubt NAND Flash

[cloudff7]

NAND flash memory has a data retention time of between 10 and 20 years without power and without use. Does a few or 1 write on this chip interfere with the data retention time without power and without use?

Is 10 to 20 years for 1 write stored in the long term or is it related to the number of writes?

[Electronics Wizardy]

The tempature of writing and storage, and amount of writes affects long term storage time.

 

But generally a single SSD isn't optimal for long term offline storage.

[cloudff7]

here home temperature 33-35C cicles write 2 ou 3 times and storage

[Electronics Wizardy]

2 minutes ago, cloudff7 said:

here home temperature 33-35C cicles write 2 ou 3 times and storage

Also why SSD for long term storage? Multiple HDDs is probably the same price, and more likely to be readable after decades.

[TetraSky]

If you want to archive something for dozens of years, look into M-discs.

Everything else is prone to degradation over time. While a BD-R M-disc 25GB/50GB/100GB should last your entire lifetime. And then some. 

 

Quote

Unlike traditional optical media, which utilize dyes that can break down over time, data stored on an M DISC is engraved on a patented inorganic write layer – it will not fade or deteriorate. This unique engraving process renders these archival grade discs practically impervious to environmental exposure, including light, temperature and humidity.

 

• Projected lifetime of several hundred years (based on ISO/IEC 16963 testing)
• Stored data is engraved – ultimate archival solution
• Impervious to environmental exposure, including light, temperature and humidity
• Withstood rigorous testing for durability by US Department of Defense

 

 

[kokosnh]

2 hours ago, cloudff7 said:

NAND flash memory has a data retention time of between 10 and 20 years without power and without use. Does a few or 1 write on this chip interfere with the data retention time without power and without use?

Is 10 to 20 years for 1 write stored in the long term or is it related to the number of writes?

The data in nand is stored as a charge, it will leak, no matter what you do.

but depending on the storage temperature, it can leak faster, or slower.

depending on the nand type (MLC, TLC, QLC), the nand memory cell margin of error will have approximating 0.7V error, 0.3V error, or 0.1V error window ( don't remember the exact numbers ). 
depending on wear of the NAND, the more free charge will be trapped in isolation layer, and that can do different things depending on the nand type (FG, CTF etc ).

For now the assumption is you can somewhat safely store 5-10 year on MLC SSD, 3-5 years on TLC SSD, and 1-3 year on QLC SSD.
but that’s just the safety margin. The results are very dependent on the storage temperature, and nand type, and nand wear. 
 

short answer, don’t use ssd for cold storage, and if you do, store them in a freezer ( double foil bag, and a dehumidifier pack )

[cloudff7]

what NAND type used in PCB memory card 8MB PS2?