FSs designed to run on dumb flash exist: <a href="https:&#x2F;&#x2F;encrypted.google.com&#x2F;#q=site:lwn.net+nand+flash+filesystem" rel="nofollow">https:&#x2F;&#x2F;encrypted.google.com&#x2F;#q=site:lwn.net+nand+flash+file...</a><p>&gt; I don&#x27;t see why people try to design filesystems that do everything.<p>For general use, [0] I would rather use a FS that works on pretty much every media type [1] -and has reasonable perf- than to have to worry about whether $SPECIALTY_FS is actually tuned for $WEIRDO_BLOCK_DEVICE, or if I&#x27;ve failed to understand the particulars of either the FS, device, or both.<p>[0] That is, when getting the absolute <i>best</i> perf isn&#x27;t a requirement.<p>[1] Except for like, tape, and optical RAM&#x2F;WORM drives, natch.