Unmount partition on boot on macOS®

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Get the "Volume UUID" of the partition

diskutil info /Volumes/MyPartition

# or:

diskutil list
diskutil info /dev/disk2s3

Open new "fstab" editor

cd /etc
sudo vifs

Navigate to last line and type "o" to start edit mode

# for "NTFS" partition enter:
UUID=AA3365B4-XXX... none ntfs ro,noauto

# for "apfs" partition enter:
UUID=AA3365B4-XXX... none apfs rw,noauto

# for "HFS+ / Mac OS Extended" partition enter:
UUID=AA3365B4-XXX... none hfs rw,noauto

finally press "enter" and "esc" right after. Then type "ZZ" to save and exit. In terminal type in following and restart macOS afterwards:

sudo automount -vc

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