F2FS is flash-friendly file system, designed from scratch (by Samsing)
for flash devices. Some benchmarks look encouraging.
https://www.phoronix.com/vr.php?view=27370
I've been using ext2 on flash drives to avoid the overheads of
journalling in other systems like ext4. For my Qubes install, I want
f2fs. Last I heard, the Qubes installer did not support it. There's an
open feature request for this, but developers have assigned it a low
priority.
Would this procedure work for Qubes?