You are not authorized to mount this device [External HDD]

NTFS filesystems need to be mounted a specific way. Often people are successful adding a special entry for it in /etc/fstab, but be mindful that often times you need to be specific about permissions while writing the entry.

Here is an example of an entry from Arch Wiki:

/dev/*NTFS-partition* /mnt/windows ntfs-3g uid=username,gid=username,dmask=022,fmask=133 0 0

Here is where you can learn more about this: NTFS-3G - ArchWiki

Here is an example of another thread where a similar solution was discussed: Write on file's SSD NTFS not working - #11 by dalto

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