for ((size = SIZE_FROM; size <= SIZE_END; size += A_PRIME_NUM)); do
run_check truncate -s "$size"M "$IMAGE"
run_check mkfs.ext4 -F "$IMAGE"
for ((size = SIZE_FROM; size <= SIZE_END; size += A_PRIME_NUM)); do
run_check truncate -s "$size"M "$IMAGE"
run_check mkfs.ext4 -F "$IMAGE"