Oh yeah, there was a recent change in UBIFS (the Linux flash filesystem) to support MLC NAND. Previously it could only use half the pages because a power failure when writing to pages in the other half would corrupt the contents of an already-written page. This is being solved by writing data to only the first half of the pages in each erase block initially, then consolidating them into new erase blocks that can be fully filled later: http://lists.infradead.org/pipermail/linux-mtd/2016-May/0673...
> We’ve also added a new driver for MLC NAND support, so once you flash your PocketC.H.I.P., you’ll have 8GB of storage!