Just to add. After you have ADF'd them and before you throw them away, it may be worth offering the disks for the cost of postage.
I'm pretty sure some users would be interested in them and its better than them been binned!
There is quite a few disks that are missing label scans too, there used to be a list on another forum but it has now closed. There is a effort underway to revive that list on here, you can view the details and progress at
http://eab.abime.net/showthread.php?t=89583.