thanks for good information . i read a page that says that note PC using as 24 hour server fired , and his apartment was burned . so i use a banana pi M1 as sshd & www server . now its OS is archlinux . archlinux uses sata hard disk directly .
------------------ namely $ df Filesystem 1K-blocks Used Available Use% Mounted on /dev/root 15412688 5383016 9246728 37% / devtmpfs 447576 0 447576 0% /dev tmpfs 447688 0 447688 0% /dev/shm tmpfs 447688 468 447220 1% /run tmpfs 447688 0 447688 0% /sys/fs/cgroup tmpfs 447688 0 447688 0% /tmp tmpfs 89536 0 89536 0% /run/user/1001 /dev/sda1 74831752 14111032 56919380 20% /WWW <---------sata 80GB ---- but but arch arm's sshd server cannot use 'PasswordAuthentication no' . too dangerous . but running desktop as 24 hour sever is expensive and rental server is not convinient to use . so i want to use openbsd's arm as server . --- regards