This is a workaround to make the SSD 2.5" work!

hook_file

#!/usr/bin/ash
# /etc/initcpio/hooks/load_ssd

run_hook() {
    rtcwake -u -m mem --date +1s
}

install_file

#!/bin/bash
# /etc/initcpio/install/load_ssd

build() {
    add_binary /usr/bin/rtcwake
    add_runscript
}

LOAD_SSD.md

This is a workaround to make the SSD 2.5" work!

1. Create /etc/initcpio/install/load_ssd and /etc/initcpio/hooks/load_ssd
2. Edit /etc/mkinitcpio.conf
3. Run sudo mkinitcpio -P

mkinitcpio.conf

# /etc/mkinitcpio.conf

# ...
##   NOTE: If you have /usr on a separate partition, you MUST include the
#    usr, fsck and shutdown hooks.

HOOKS="base ... load_ssd"
#...