f3write on fails(?) on ffs:
	Creating file 1.h2w ... 85.80% -- 178.17 MB/s -- 1s
	[ 28376.7885906] /mnt: write failed, file system is full
	OK!
	Free space: 796.00 KB
	Average writing speed: 176.36 MB/s

f3read fails on FAT:
	assertion "!fdatasync(fd)" failed: file "f3read.c", line 162, function