I am working on a project which is supposed to be built in small quantities (less than 50 units/year), but will probably be sold for 10 or 15 years. I am at the stage where I look at the non volatile memory, and we plan to use something like 16-32GB.
In the past, we used SD Cards, but we faced some reliability problems with the holder, as the SD Card sometimes came out of the socket. We also found that a particular card is likely to become obsolete after a few years, so we always have to check that alternative parts would work the same.
I had a look into the following technologies, and I found some inconvenients:
- SD Card: need for a mechanical part to hold it, obsolete after a few years
- Flash ICs: complex to interface
- eMMC: difficult to source
- EEPROM: small capacity (<100MB)
Did I miss something? Is there any other reliable solution to replace an SD Card on a design?
Edit: the application would continuously write data (a few kB per second), but during several hours or sometimes days. The retention time is not a big deal, as long as it is reasonable.