К Raspberry Pi4 примонтирован HDD.
В /etc/fstab добавлена строка:

UUID=51617db1-97f4-48f1-ba7b-8535f852c8e4    /home/srmn/archives   ext4         users,defaults         0       2

При физическом отключении жёсткого диска система не загружается.
Получаю следующее сообщение об ошибке:

You are in emergency mode. After logging in, type "journal -xb" to view system logs, "systemctl reboot" to reboot, "system default" or "exit" to boot into default mode.

Cannot open access to console, the root account is locked.
See sulogin(8) man page for more defaults.

Press Enter to continue.

Содержимое журнала загрузки sudo tail -n 10000 /var/log/boot.log:

[  OK  ] Started Show Plymouth Boot Screen.
[  OK  ] Started Forward Password Requests to Plymouth Directory Watch.
[  OK  ] Reached target Local Encrypted Volumes.
[  OK  ] Found device /dev/disk/by-partuuid/c5c7b7be-01.
         Starting File System Check on /dev/disk/by-partuuid/c5c7b7be-01...
[  OK  ] Finished File System Check on /dev/disk/by-partuuid/c5c7b7be-01.
         Mounting /boot...
[  OK  ] Mounted /boot.
[  OK  ] Listening on Load/Save RF …itch Status /dev/rfkill Watch.
         Starting Load/Save RF Kill Switch Status...
[  OK  ] Started Load/Save RF Kill Switch Status.
[  OK  ] Finished Wait for udev To Complete Device Initialization.
[ TIME ] Timed out waiting for device /dev/disk/by-uuid/51617db1-97f4-48f1-ba7b-8535f852c8e4.
[DEPEND] Dependency failed for File System Check on /dev/disk/by-uuid/51617db1-97f4-48f1-ba7b-8535f852c8e4.
[DEPEND] Dependency failed for /home/srmn/archives.
[DEPEND] Dependency failed for Local File Systems.
[  OK  ] Stopped Forward Password Requests to Wall Directory Watch.
[  OK  ] Reached target Timers.
[  OK  ] Reached target Sound Card.
         Starting Enable support for additional executable binary formats...
[  OK  ] Reached target System Time Synchronized.
         Starting Set console font and keymap...
[  OK  ] Reached target Login Prompts.
         Starting Raise network interfaces...
         Starting Preprocess NFS configuration...
[  OK  ] Closed Syslog Socket.
[  OK  ] Reached target Paths.
[  OK  ] Reached target Sockets.
[  OK  ] Started Emergency Shell.
[  OK  ] Reached target Emergency Mode.
         Starting Tell Plymouth To Write Out Runtime Data...
         Starting Create Volatile Files and Directories...
[  OK  ] Finished Set console font and keymap.
[  OK  ] Finished Preprocess NFS configuration.
         Mounting Arbitrary Executable File Formats File System...
[  OK  ] Reached target NFS client services.
[  OK  ] Reached target Remote File Systems (Pre).
[  OK  ] Reached target Remote File Systems.
[  OK  ] Finished Tell Plymouth To Write Out Runtime Data.
[  OK  ] Mounted Arbitrary Executable File Formats File System.
[  OK  ] Finished Enable support for additional executable binary formats.
[  OK  ] Finished Create Volatile Files and Directories.
         Starting Update UTMP about System Boot/Shutdown...
[  OK  ] Finished Update UTMP about System Boot/Shutdown.
         Starting Update UTMP about System Runlevel Changes...
[  OK  ] Finished Update UTMP about System Runlevel Changes.
[  OK  ] Finished Raise network interfaces.
[  OK  ] Reached target Network.
[  OK  ] Reached target Network is Online.

Я временно обошёл данную проблему, добавив монтирование диска в rc.local

По какой причине одноплатник не запускается без примонтированного внешнего жёсткого диска?