The "other" partition must be mounted first.
Since the "other" partition is part of a Mandriva partition, rather than it's own separate partition, it would make sense to mount it somewhere out of the ordinary.
Go to the command line and create a new directory.
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su
password: ********
cd /mnt
md /mnt/mandriva
exit
Next, you want this existing partition to be mounted. Either copy fstab to your home directory, edit it, and re-save it, or edit it on the spot. I'll use kwrite here (don't forget the "-" after su. Go to the command line, edit the file:
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su -
password: ********
cd ~
kwrite /etc/fstab
exit
In kwrite, add a new mount location:
/sdb3 /mnt/mandriva defaults
I'm doing this from memory, so it's likely incorrect. Please use man fstab to see proper method to add options on the added line.
Save the edited /etc/fstab file so that it gets mounted on boot next time.
Next, check that it works. On the command line:
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su
password: ********
mount /mnt/mandriva
ls -l /mnt/mandriva
You should see the mandriva "/" directory at this point. If not, review where you might have gone wrong up above.
Next, you need to make sure that the user and group id values are the same for John (on Mandriva), and John (on Mageia). If they are the same, then that is good, you can provide a simple link. If not, you need to decide if you want to change the user ID on Mandriva, Mageia, or if you want to change the data to permission "other" =6 or 7.
Assuming that John was user 500 on Mandriva, and also 500 on Mageia, the next step is simple. remove the Data you have right now, and next, create the symlink.
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cd ~
ln -s /mnt/mandriva/home/John/Data /home/John/Data
Should work, but not tested, so, sorry about any typo errors above if you find them.