thanks, NTFS and utils

For the extreme low end (SD cards, specifically), NTFS does not help because the SD card standard mandates not only the exact type of file system to be used (FAT16 up to 2 GB, FAT32 from 4 to 32 GB, ExFAT from 64 GB to 2 TB), but also the specific layout.

For USB sticks, the situation may be a little better because I've seen ads for ones that are allegedly optimized for NTFS. I have yet to get hold of those to find out what they do.

On the negative side, I have seen one USB stick with the typical FAT optimization (the second 4 MB segment being optimized for random access), which came preformatted with the FAT in another segment.

Regarding logfs, in theory it should be really well optimized for SSDs and it can work on a block device. Unfortunately, it's designed on the assumption that you can have around a dozen segments open at a time, which I have shown not to be possible on most media. However, if you can get the alignment and the layout right, logfs should still give you the best possible performance of the drive as long as you don't do a single fsync, at which point it will theoretically get into the worst case of thrashing.

jffs2 is completely useless on multi-gigabyte media, and does not really work on block devices.

ubifs on top of ubi on top of mtd on top of block2mtd on top of the block device might be an option, but stacking so many layers sounds scary to me.