Two things you can try are key chain first aid and keychain reset, altough these in-house solutions hardly ever fixed anyhting for me. This is based on the fact that when some apps keep asking for passwords stored in the keychain, it's sometimes related to a corrupt keychain DB (Address Book's empty DB comes already corrupt on every new Mac - sarcasm).
As Apple replied to the ticket referenced in mattdwen's Open Radar link above, as of macOS Sierra 10.12,
you can no longer create items in /Volumes unless root.
Further, my best understanding of the AppleScript mount volume command is that it doesn't have a way to specify the mount point and consequently it only mounts volumes under /Volumes through the Finder's standard mechanism. So, I don't think you can do it via AppleScript.
But there's another way. You can accomplish the same thing using the lower level mount command:
mkdir -p ~/mnt
mount_smbfs "//my_username:my_password@my_hostname/share" ~/mnt
After mounting the volume this way, you should see a normal "volume" icon appear on your desktop and the ~/mnt directory will appear as "share" when you browse your user directory via Finder.
The one thing missing from this approach is saving the login credentials in Keychain. To do that, you have to do a bit more scripting. Something like this.
Save the password:
security add-generic-password -a my_username -s my_hostname -w my_password
Retrieve the password and mount the share:
pass=$(security find-generic-password -a my_username -s my_hostname -w)
mount_smbfs "//my_username:${pass}@my_hostname/share" ~/mnt
NOTE: If you have special characters in your password, you will probably need to URL encode it, perhaps like this:
pass='my !@#%%^& password'
pass=$(php -r "echo urlencode(\"$pass\");")
>>> my+%21%40%23%25%25%5E%26+password
Best Answer
You can edit
/etc/fstabif you don't want a partition to mount on startup. I haven't tried personally but there's a writeup at Mac OS X Hints.In short, get the UUID of the partition and add something like: