SPI chips are unreasonably expensive per MB compared to NAND, some reasons on why: https://electronics.stackexchange.com/questions/32200/why-is-spi-flash-memory

SPI chips are unreasonably expensive per MB compared to NAND, some reasons on why: https://electronics.stackexchange.com/questions/32200/why-is-spi-flash-memory-so-limited-in-max-size-and-cost-way-more-per-mb-than https://electronics.stackexchange.com/questions/32200/why-is...