Check out this thread for a little info on how to identify the TY disks:
http://www.thetradersden.org/forums/...ead.php?t=8812
There are also programs that you can run that analyze a sector on the disc thats tell you more info about it, but unfortunately you have to open the spindle to do that - it's only good if you need to know what you "got stuck with", unless you are able to return them to the place of purchase.
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