minimizediskaccess.txt

# to reduce diskaccess .

systemctl stop rsyslog
systemctl disable rsyslog
systemctl stop systemd-timesyncd
systemctl disable systemd-timesyncd
systemctl stop dphys-swapfile # no swap on disk.
systemctl disable dphys-swapfile

apt install chrony

# Please use chrony for NTP to nodiskaccess.
# Please use systemd-journald with volatile,edit /etc/systemd/systemd-journald.conf
# Please use tmpfs on /tmp,edit /etc/fstab.

# According to ...
# https://wiki.archlinux.org/index.php/Installing_Arch_Linux_on_a_USB_key#Minimizing_disk_access
# https://wiki.archlinux.org/index.php/Systemd-timesyncd , read leading text.
# https://wiki.archlinux.org/index.php/Tmpfs

1 More !
How about using zram ? :P

apt install zram-tools

edit /etc/default/zramswap
add swappiness=100 on /etc/sysctl.conf

# you can add compressed memory by 75% physical memory.
# https://wiki.debian.org/ZRam

at last ,reboot!


# In addition,If you use raspbian,to stop polling disk remove wifi manager from desktop bar.
 
1 More!
Browser Profile in tempfs
https://wiki.archlinux.org/index.php/Firefox/Profile_on_RAM#Place_profile_in_RAM_manually

or use this
https://github.com/StuartIanNaylor/zram-swap-config
very useful tool for Debian descend.