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mkfs.ext4 -O ^has_journal /dev/sda10
EDIT: The answer to this question depends on what/how often porteus writes to the disk, and that depends on whether we use "changes=EXIT:". But in any case, according to this thread viewtopic.php?f=48&t=5642&p=43376, the /tmp always lives in RAM. Couldn't find where the "/var/log" lives, hopefully also as tmpfs. Anyway, with writing to the USB already minimized perhaps journalling parameters of the USB filesystem and how it's mounted are less important, but I'd still want to hear a definite answer on how exactly to format my USB before I install porteus on it.