I have a hynix which people say has a high chance of failure but mine still works( I have had this close to the start of the wii u lifespan), ether I am lucky or some people are just not good at looking after their wii u.

how to know

Same, i also have the samsung NAND :)

I have Samsung! :)

smasnug

Samsung nands are turely a cheap choice for old gaming consoles. There are many cheap second-hands Samsung nands on the market that could be used for console's storage expansion.

mine is a toshbia chip