Looking at your situation and assuming following details I am mentioning the following solution I hope it will help you to solve your problem. Well I am assuming that Linux Mint 9 is installed on sda5 partition and Linux Mint 10 is installed on sda6 partition. Now you have to launch the terminal and copy paste the following code on the terminal
Code:
sudo mkdir /media/sda5
sudo mount /dev/sda5 /media/sda5
Well using above solution you will be able to use file browser of desire choice to navigate into old partition of the Linux Mint. I will be really delighted if the above mentioned code is helpful to you.
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