Maybe they're worried about bit flips before the data gets to emmc? They probably aren't doing it, but you could always interleave the data across the emmc blo

Maybe they're worried about bit flips before the data gets to emmc? They probably aren't doing it, but you could always interleave the data across the emmc blocks. A lost emmc block would therefore corrupt single-digit bytes across many ECC'ed blocks, rather than many bytes within a couple ECC'd blocks. 32 bytes of Reed Solomon should be able to correct up to 16 bytes of corruption. CDs do the same trick to be robust to scratches.